11,167 research outputs found
Gu hua pin lu.
No full text謝赫撰 ; 毛晉訂. 續畫品錄 / 李嗣眞撰 ; 毛晉訂. 後畫錄 / 彥悰撰 ; 毛晉訂.綫裝, 1函.框19.2x13.5公分, 8行19字, 白口, 無魚尾, 左右雙邊, 版心上鐫題名, 中鐫葉次, 下鐫"汲古閣".原屬《津逮秘書》叢書第7集?With: 續畫品并序 / 姚最撰 ; 毛晉訂.Xian zhuang, 1 han.Kuang 19.2 x 13.5 gong fen, 8 hang 19 zi, bai kou, wu yu wei, zuo you shuang bian, ban xin shang juan ti ming, zhong juan ye ci, xia juan "Ji gu ge".Yuan shu "Jin dai mi shu" cong shu di 7 ji?Xie He zhuan ; Mao Jin ding. Xu hua pin lu / Li Sizhen zhuan ; Mao Jin ding. Hou hua lu / Yan Cong zhuan ; Mao Jin ding.With: Xu hua pin bing xu / Yao Zui zhuan ; Mao Jin ding
Process Variation Aware Clock Tree Routing (Extended Abstract)
No full textBing Lu Cadence Design Sys. Inc
Cyrtomium calcis Liang Zhang, N. T. Lu & Li Bing Zhang 2023, sp. nov.
No full textCyrtomium calcis Liang Zhang, N.T.Lu & Li Bing Zhang, sp. nov., Fig. 1 Type:— VIETNAM. Hagiang Province: Vi Xuyen District, Tung Ba Community, Du Gia National Park (Khau Ca Nature Reserve), Hom Mountain, 22°50’40’’N, 105°07’47’’E, elev. ca. 1150 m, on the top of limestone mountain, 13 December 2013, Li Bing Zhang, Liang Zhang & Ngan T. Lu 6932 (holotype VNMN!; isotypes CDBI!, MO!). Diagnosis: This species is most similar to Cyrtomium pachyphyllum (Rosenstock 1914: 130) C.Christensen (1917: 11) in having erect rhizomes, dense, concolorous, and fimbriate-dentate scales throughout fronds, leathery lamina, ovate pinnae, and dentate indusia, but the new species has ovate scales on stipe base (vs. lanceolate scales in C. pachyphyllum), lanceolate-oblong lamina (vs. oblong lamina in C. pachyphyllum), up to 14 pairs of pinnae (vs. often 1–5 pairs in C. pachyphyllum), lowest pinnae shorter than the middle ones (vs. similar in C. pachyphyllum), fewer rows of areolae (2–(4)) in venation structure (vs. up to 5 rows of areolae in C. pachyphyllum). Plants terrestrial, perennial, evergreen. Rhizome erect, densely covered with ovate, lanceolate, linear, brown scales. Stipe stramineous, 15 cm long, 1–3 mm in diam., base densely scaly, scales membranous, concolorous, reddish-brown, ovate, lanceolate or linear (6–20 × 0.3–4.4 mm), fimbriate-dentate, apex long acuminate or slight twist; upward densely scaly, scales brown, narrow lanceolate, linear (2.5–6.0 × 0.1–0.7 mm). Lamina 1-imparipinnate, lanceolate-oblong (13–23 × 1.9 cm), base cordate to hastate, apex acute to slight acuminate, thick leathery; rachis ca. 1.5 mm in diam. with dense scales abaxially and adaxially, scales similar to scales on distal stipe but smaller (1–1.5 × 0.05–0.5 mm); pinnae alternate, 9 to 14 pairs, short-stalked or nearly sessile, ovate (1.5–3.5 × 1.2–1.9 cm), both adaxial and abaxial sides with microscales, glossy adaxially, margin entire, acroscopic base auriculate, blunt auricle, auricle overlap each other, apex acute; lowest pinnae shorter than middle ones, upper pinnae ovate, up to 3.5 × 1.9 cm; terminal pinna deltoid-ovate (1.5–2.5 cm); venation pinnate, obscure, veinlets form 2, 3, rarely to 4 rows of areola, each areolae with 1 included veinlet. Sori rounded (ca. 1.5 mm in diam.), 1–25 or more per pinna, 1 or 2(–3) rows on each side of midrib; indusia orbicular (1.3–1.9 mm in diam.), dentate; spores large, ellipsoid (54–60.6 µm in diam.), inflated tuberculate folds, plain exospore. Etymology:— The specific epithet, calcis, is formed from the Latin word calcis, relating to lime. It refers to the limestone habitat of this new species. Geographical distribution and habitat:— Types were collected from a limestone peak in primary evergreen broad-leaved forests in Khau Ca Nature Reserve, Vi Xuyen District, Hagiang Province. Community is composed of some taxa accompanying the new species as Cyrtomium hemionitis Christ (1910: 138), Polystichum minimum (Y.T. Hsieh 1989: 17) Li Bing Zhang (2012: 58), P. auriculum Ching (1949: 309), an Ericaceae, a Lauraceae, and an Orchidaceae. Two small populations of the new species were also found in Guangxi, China. Provisional conservation status:— Only a few mature individuals of Cyrtomium calcis were seen in the type locality although a few field investigations have been conducted by Vietnamese colleagues and the first author since 2013. Two populations in Guangxi, China were quite small and the three localities in China and Vietnam are only about 92 km in air distance. Based on current information and following the IUCN Guidelines (IUCN 2022), the new species is temporarily assessed as Critically Endangered C 2a (i, ii). Additional material examined:— CHINA. Guangxi: Napo County, elev. ca, 1300 m, 17 June 1982, Ding Fang, Mao-Xiang Lai & Zhen-Gang Wang 25384 (GXMI); elev. ca. 1250 m, 17 July 1985, Ding Fang & De-Hai Tan 79661 (GXMI). Tianlin County, elev. ca. 1490 m, 29 January 2016, S.L. Jin JSL3613 (CSH, paratype). Notes:— Cyrtomium calcis is endemic to the limestone areas, but it is not closely related to other species endemic to limestone areas, e.g., C. hemionitis, C. nephrolepioides (Christ 1902: 258) Copeland (1929: 136), C. pachyphyllum, and C. shingianum H.S.Kung & P.S.Wang (1997: 23), as shown in our phylogenetic tree (Fig. 2). The phylogenetic relationships of C. calcis are quite isolated and it is resolved as one of the earliest diverging lineages. Therefore, the discovery of C. calcis is quite significant in studying the phylogeny and evolution of the genus. Morphologically, the limestone species of Cyrtomium share a distinct morphological feature, the presence of the cordate pinna base (except C. chingianum P.S.Wang 1997: 24) (Lu & Cheng 2003, Zhang & Barrington 2013) and the new species bears gross morphological features that are consistent with those in other limestone species, e.g., thicker pinna texture, fewer pairs of pinnae per frond, broader pinnae, and more rows of areolae in venation structure (Mitsuta 1977, Lu & Cheng 2003, Zhang & Barrington 2013). The fact that C. calcis is not closely related with other limestone species in the genus suggests that these morphological similarities are homoplasious. The discovery of Cyrtomium calcis is also contribution to the limestone flora in northern Vietnam that is currently not well understood (e.g., Lu et al. 2014, also see below).Published as part of Lu, Ngan Thi, Wei, Hong-Jin, Vuong, Luong Dinh, Toan, Le Chi, Zhang, Li-Bing & Zhang, Liang, 2023, Cyrtomium calcis sp. nov. and six new records of the shield fern family (Dryopteridaceae) from Vietnam, pp. 15-26 in Phytotaxa 583 (1) on pages 16-18, DOI: 10.11646/phytotaxa.583.1.2, http://zenodo.org/record/760903
Guangdong yue ju tuan pi pan Hongxiannü fan dong lu xian
No full text作者, 美院红画兵.文字:粤剧独唱 广東粤剧团批判红线女反动路线;下款: 美院红旗画兵 一九六七年四月五日 参展号: 0208 作者: 美院红画兵 ; 印記: 广州美术学院 红旗畫兵 造反兵团.裝裱後高寬: 138 x 51 cm.Zuo zhe, Mei yuan hong hua bing.Wen zi : Yue ju du chang Guangdong yue ju tuan pi pan Hongxiannü fan dong lu xian; Xia kuan : Mei yuan hong qi hua bing 1967 nian 4 yue 5 ri can zhan hao : 0208 zuo zhe : Mei yuan hong hua bing ; Yin ji : Guangzhou mei shu xue yuan hong qi hua bing zao fan bing tuan.Zhuang biao hou gao kuan : 138 x 51 cm
Polystichum pseudodangii Li Bing Zhang, N. T. Lu & Liang Zhang 2023, sp. nov.
No full text<i>Polystichum pseudodangii</i> Li Bing Zhang, N.T.Lu & Liang Zhang, <i>sp. nov.</i> (Fig. 1). <p> <b>Type:—</b> VIETNAM. Ha Giang Province: Quan Ba District, Nghia Thuan Commune, Bat Dai Son Nature Reserve, elev. ca. 1260 m, 23° 7’57.41” N, 104°55’43.89” E, 10 December 2013, limestone mountain, <i>Li Bing Zhang, Liang Zhang & Ngan T. Lu</i> 6891 (holotype VNMN!; isotypes CDBI!, MO!).</p> <p> <i>Diagnosis:—</i> This species is most similar to <i>Polystichum dangii</i> P.S.Wang in Wang & Wang (2001: 531) in having oblong and coriaceous pinnae with entire margins and rounded apex and sori close to pinna margin, but the former has blackish petiole scales, longer frond (up to 38 cm), pinnae attached at 70° (–90°) angles to rachis, more pairs of pinnae (22–29 pairs) per lamina, auriculate pinnae, and sori above the midrib up to 10 pieces, whereas the latter has brown petiole scales, shorter frond (up to 22 cm), pinnae attached at 120° (–140°) angles to rachis, fewer pairs of pinnae (5–21 pairs) per lamina, exauriculate pinnae, and sori above the midrib up to 4 pieces.</p> <p>Plants medium-sized, evergreen, 23–30 cm tall. Rhizomes erect, ca. 1 cm in diam.; roots blackish when dried, up to 15 cm long, ca. 0.4 mm in diam. Fronds 11–15 per rhizome; stipe brown, 4–11 cm long, ca. 0.7 mm in diam., basal stipe scales brown, lanceolate (or ovate-lanceolate), 1.5–1.7 × 6.0–8.0 mm, thin papery, brown, margins entire, apex acuminate, twisted in the margins; distal petiole scales subulate, lanceolate, 0.3–0.7 × 0.8–5.0 mm, membranous, margins irregular dentate, apex long-acuminate. Laminae 1-pinnate, lanceolate, 2.8–3.5 × 17–27 cm, apex acuminate; rachises ca. 1 mm in diam., stramineous, adaxially sulcate, sparsely scaly; abaxially densely scaly; scales appressed, subulate with rounded base, brown to light brown at the base, dark brown at the apices, long acuminate, margin dentate at base, irregular dentate at distal part. Pinnae in 22–29 pairs, alternate, or sometimes opposite at base, attached at 70° (–90°) angles to rachis, separate or overlapped by auriculate, rarely imbricate, 0.7–1.3 cm distant (from attached point), acroscopic blunt auriculate; basal pinnae broadly oblong to obliquely oblong, 0.6–1.0 × 1.1–1.5 mm, sessile, 2 basal pairs up to 1.3 cm apart, apices of obtuse, sometimes obtuse-rounded, broadly acute, bases obviously asymmetrical, acroscopic base with auricles, apex of auricles acute, margin entire; middle pinnae longest, oblong to slightly oblong, 0.4–0.7 × 1.2–1.5 cm, sessile, bases acute to obtuse, margins entire, apices as basal pinnae; adaxially glabrous, abaxially sparsely covered with filiform, light brown microscales; frond texture leathery; venation distinct abaxially, slightly distinct adaxially; lateral veins nearly reaching pinna margin, pinnate, lateral veins simple. Sori small, often on distal part of pinnae, lower pinnae often not seen sori, terminal on lateral veinlets, 0.75–0.95 mm in diam., close to pinna margin, 0–10 on acroscopic side and 0–4 on basiscopic side, centers ca. 1 mm apart from one another; indusia thick, brown, small, repand, often evanescent.</p> <p> <b>Etymology:</b> —From the Latin prefix, <i>pseudo</i>, false, and <i>dangii</i>, referring to the similarities between the new species and <i>Polystichum dangii</i>.</p> <p> <b>Distribution:—</b> This species is currently found only in Ha Giang Province, northern Vietnam. It is locally quite common in Ha Giang Province. It is not found in the neighboring Chinese side of the mountains.</p> <p> <b>Notes</b>: <b>—</b> We collected <i>Polystichum pseudodangii</i> in 2013 for the first time and we reported it as “ <i>P. dangii</i> ” (Lu <i>et al.</i> 2014a) based on the leathery lamina texture, entire pinnae, and adjacent distributions of the two species [northern Vietnam and southern China (Guangxi and northern Guizhou); Zhang & Barrington 2013]. There are only a few species in <i>P</i>. sect. <i>Haplopolystichum</i> Tagawa (1940: 122) with leathery lamina and entire pinnae. However, our unpublished subsequent molecular work shows that the two are not even closely related.</p> <p> <b>Additional materials examined (paratypes</b>): <b>—</b> VIETNAM. Ha Giang Province: Quan Ba District, Bat Dai Son Commune, Sa Phin Village, Bat Dai Son Nature Reverse, limestone mountain, 05 June 2021, <i>N. T</i> <i>.</i> <i>Lu 07-HG2021</i> (VNMN!); Nghia Thuan Commune, Bat Dai Son Nature Reserve, 23°07’57’’ N, 104°55’44’’ E, elev. ca. 1250 m, in limestone crevices, 10 December 2013, <i>Li Bing Zhang, Liang Zhang & Ngan T</i> <i>.</i> <i>Lu 6877</i> (CDBI!, MO!, VNMN!).</p>Published as part of <i>Lu, Ngan Thi, Zhang, Liang, Thanh, Nguyen Trung, Toan, Le Chi & Zhang, Li-Bing, 2023, Three new species and one new record of the fern genus Polystichum (Dryopteridaceae) from Vietnam, pp. 85-94 in Phytotaxa 607 (1)</i> on page 86, DOI: 10.11646/phytotaxa.607.1.7, <a href="http://zenodo.org/record/8212241">http://zenodo.org/record/8212241</a>
Polystichum unicum Li Bing Zhang, N. T. Lu & Liang Zhang 2023, sp. nov.
No full text<i>Polystichum unicum</i> Li Bing Zhang, N.T.Lu & Liang Zhang, <i>sp. nov.</i> (Fig. 2). <p> <b>Type:—</b> VIETNAM. Ha Giang Province: Vi Xuyen District, Tung Ba Commune, Du Gia National Park (Khau Ca Nature Reserve), Hom Mountain, 22°50’40’’N, 105°07’47’’E, elev. ca. 1150 m, at the top of a limestone mountain, 13 December 2013, <i>Li Bing Zhang, Liang Zhang & Ngan T. Lu 6933</i> (holotype VNMN!; isotypes CDBI!, MO!)</p> <p> <i>Diagnosis:—</i> This is a very distinct species and does not seem to be similar to any species known so far in having the combination of crenulate pinna margins, distal basiscopic pinna margins forming a ca. 140° angle with the rachis, acute pinna apex, and auricles overlapping the rachis.</p> <p>Plants medium-sized, evergreen, 23–27 cm tall. Rhizomes erect, ca. 1 cm in diam., scales similar to those of the stipe base, but softer, crushed; roots blackish when dried, up to 12 cm long, ca. 0.3 mm in diam., densely covered with red iridescent hairs. Fronds in clusters but few, 5 or more per rhizome; stipe brown, 7–9 cm long, ca. 0.6 mm in diam., scales subulate, lanceolate or ovate-lanceolate, 0.5–3.0 × 0.4–0.8 mm, brown-blackish on abaxial side, glossy-blackish on adaxial side, thick papery, margins entire, often light brown, apex acuminate or long twisted; distal petiole scales long subulate, narrow lanceolate, 0.3–0.5 × 1.2–3.2 mm, thick membranous, margins subentire to irregular dentate, apex long-acuminate. Laminae 1-pinnate, lanceolate, 2.7–3.7 × 15–20 cm, apex long acuminate; rachises ca. 1 mm in diam., stramineous, adaxially sulcate, sparsely scaly, abaxially densely scaly; scales appressed, brown, subulate with rounded base, thick membranous, long acuminate, up to 2 mm long, margins dentate at base, irregular sparsely dentate at distal part. Pinnae ca. 22 pairs, alternate, distal basiscopic margins forming a ca. 140° angle with rachis, proximal margins attached at 75° (–90°) angles to rachis, separate, 0.6–1.1 cm distant (from attached point), acroscopic auriculate; basal pinnae obliquely oblong, 0.5–1.2 × 2.0–6.0 mm, short stalked, apices acute, sometimes obtuse, bases obviously asymmetrical, acroscopic base with deltate or semicircular auricles, and proximal margins of auricles often overlapping rachis, margins both sides toothed, teeth mostly long spinulose apically; middle pinnae largest, oblong to obliquely oblong, 0.4–0.7 × 1.3–2.5 cm, short stalked, bases acute to obtuse, margins long spinulose, apices acute; adaxially glabrous, abaxially sparsely covered with appressed, subulate, filiform, light brown microscales; frond thickly papery texture; venation distinct abaxially, slightly distinct adaxially, lateral veins simple, nearly reaching pinna margin. Sori small, often on distal part of pinnae, lower pinnae not seen sori, often broken with debris on the leaves, terminal on shorter veinlets, 0.5–0.8 mm in diam., close to pinna margin than midvein, 0–6 on acroscopic side and 0–3 on basiscopic side, centers ca. 1 mm apart from one another; indusia not seen.</p> <p> <b>Etymology:—</b> From the Latin <i>unicum</i>, unique, referring the unique morphology of the new species in the genus.</p> <p> <b>Distribution:—</b> This species is currently found only in Ha Giang Province, northern Vietnam.</p> <p> <b>Notes</b>:— <i>Polystichum unicum</i> is somehow similar to <i>P. rectum</i> Li Bing Zhang, M.Q.Han & Yan Liu in Han <i>et al.</i> (2018: 163) in having crenulate acroscopic pinna margins, but the former has acute pinna apex, distal basiscopic pinna margins forming a ca. 140° angle with the rachis, and auricles overlapping the rachis, whereas the latter has rounded pinna apex, basiscopic distal pinna margins forming a (60–)70–90° angle with rachis, and auricles not overlapping the rachis. In addition, the new species occurs in an open mountain top with an elevation of ca. 1150 m, whereas the latter grows in a limestone cave in southern Yunnan, China, with an elevation of 2000 m.</p> <p> <i>Polystichum unicum</i> has auricles that overlap the rachis, which is less common (18 out of 48 species) than auricles that parallel the rachis.</p>Published as part of <i>Lu, Ngan Thi, Zhang, Liang, Thanh, Nguyen Trung, Toan, Le Chi & Zhang, Li-Bing, 2023, Three new species and one new record of the fern genus Polystichum (Dryopteridaceae) from Vietnam, pp. 85-94 in Phytotaxa 607 (1)</i> on pages 87-89, DOI: 10.11646/phytotaxa.607.1.7, <a href="http://zenodo.org/record/8212241">http://zenodo.org/record/8212241</a>
Hypodematium eglandulosum X. P. Fan, Liang Zhang & Li Bing Zhang 2021, sp. nov.
No full textHypodematium eglandulosum X.P.Fan, Liang Zhang & Li Bing Zhang, sp. nov. (Figs. 1, 2). Type:— CHINA. Guizhou: Zhijin County, Niuchang Town, Heba Village, on the limestone wall of a cave, 26°37’ N, 106°02’ E, 20 August 2017, Li-Bing Zhang, Yi-Fan Duan & M. Kropf 9661 (holotype CDBI!). Diagnosis:— Hypodematium eglandulosum is most similar to H. squamuloso-pilosum Ching (1977: 465) in small stature, having laminae usually 3-pinnatifid, densely covered with long acicular grayish white hairs, and lobes oblong and with obtuse apices, but the former has fronds only covered with long acicular hairs and stipes sparsely covered with acicular hairs, while the latter has fronds mixed with acicular and glandular hairs, and stipes densely covered with acicular and glandular hairs. Description:—Plants mostly small, 6–35 cm tall, lithophytic, yellowish green when dry. Rhizomes short creeping, swollen stipe bases covered with scales densely; scales reddish brown, lustrous, lanceolate, 1.5–2 cm × 1–1.5 mm, membranaceous, apex acuminate, margin dentate. Leaves distant; stipe stramineous, lustrous, usually slender, 2.5–16 cm long, 0.4–0.9 mm in diam., upward usually covered with sparsely hairs or glabrous occasionally, generally shorter than rachis; laminae deltoid-ovate, base cordate, 4–20 × 3–18 cm, base tripinnate, bipinnate upward, apex acuminate and pinnatifid; pinnae 5–8 pairs, alternate, flat or slightly oblique, basal pair largest, deltoid-ovate, base cordate, 1.5–10 × 1–6 cm, 0.1–1 cm stalked, 2-pinnate, apex acuminate; pinnules 4–6 pairs, anadromous, alternate, slightly oblique, acroscopic ones smaller, proximal basiscopic pair largest, triangular-lanceolate, shortly stalked, base cuneate or truncate, 1-pinnate, apex acuminate; secondary pinnules oblong, sessile, base cuneate, connected to each other by narrow wings, 4–6-lobed; lobes oblong, each lobe nearly entire or slightly wavy at apex, apex obtuse. Laminae chartaceous, densely covered with long acicular grayish white hairs, 0.5–0.8 mm long, about 25+ hairs/mm², margins covered with many long acicular hairs, 0.5–0.8 mm long; rachises and pinna rachises densely covered with grayish white hairs on both surfaces. Veins obvious on both surfaces, pinnate, free, reaching at margin. Sori orbicular, dorsal, medium-sized, 0.7–1.1 mm in diam., 1–3 per lobe, inframedial of veinlets, usually confluent when mature. Indusia persistent, grayish, reniform to rounded, densely covered with long gray acicular hairs, usually smaller than sori when mature. 32 spores per sporangium. Distribution & habitat:— Hypodematium eglandulosum is distributed in southern China (Guizhou, Guangxi) and Southeast Asia (Laos and Vietnam). It is not found in high elevations. It can occur inside or outside caves and grows in limestone crevices at elevations of 200–1000 m. Etymology:—From the Latin adjective, eglandulosum, without glandular hairs, referring to its plant densely covered with acicular hairs without any glandular hairs. Taxonomic notes:—Morphologically, Hypodematium eglandulosum is characterized by plants small, leaves distant and laminae 3-pinnatifid, stipes upward sparsely covered with acicular hairs, laminae and rachises densely covered with long acicular hairs, and lobes nearly entire. Hypodematium eglandulosum is distantly related with H. squamulosopilosum, though they are very similar to each other in morphology. Hypodematium eglandulosum is closely related with H. shingii Li Bing Zhang, X.P.Fan & X.F.Gao in Fan et al. (2021: 88). Our unpublished data show that H. eglandulosum constitutes a unique major clade of its own (Fan et al. submitted). In addition, H. squamuloso-pilosum, with its type being from Wuhan, occurs in central and eastern China and South Korea, whereas H. eglandulosum is distributed in southern China and Southeast Asia. The comparison of H. eglandulosum with similar species is listed in Table 1. Additional specimens examined:— CHINA. Guangxi: Jingxi City, Dizhou town, on the limestone wall of the cave, elev. 715 m, 28 January 2019, She-Lang Jin 6762 (CDBI!). Guizhou: Changshun County, Weiyuan town, on the limestone wall of the cave, 26°01’ N, 106°30’ E, elev. 1000 m, 29 October 2011, Li-Bing Zhang, Hai He & Yu Wang 5898 (CDBI!). LAOS. Gnommalat District: Khammouane Province, Tnathote Village, epiphyte on the limestone rock, elev. 200–350 m, 27 October 2007, Su-Gong Wu et al. WS-003 (KUN!). VIETNAM. Bac Kan: Na Ri, Kim Hy Com., Kim Hy NR., Ke Village, elev. 500 m, 4 December 2013, Li-Bing Zhang, Liang Zhang & Lu Thi Ngan 6706 (CDBI!). Ha Giang: Vi Xuyen District, Tung Ba Community, Hong Minh Village, Khau Ca Nature Reserve, elev. 200 m, 12 December 2013, Li-Bing Zhang, Liang Zhang & Lu Thi Ngan 6924 (CDBI!). Ha Giang: Vi Xuyen District, Tung Ba Community, Hong Minh Village, Khau Ca Nature Reserve, elev. 200 m, 12 December 2013, Li-Bing Zhang, Liang Zhang & Lu Thi Ngan 6920 (CDBI!). Hoa Binh: Tan Lac District, Tam Son Community, Ngoc Son Ngo Luong Nature Reserve, Ho Duoi Village, elev. 750 m, 22 November 2013, Li-Bing Zhang, Liang Zhang & Lu Thi Ngan 6388 (CDBI!).Published as part of Fan, Xue-Ping, Lu, Ngan Thi, Zhang, Liang & Zhang, Li-Bing, 2021, Hypodematium chrysolepis comb. nov. from Africa and H. eglandulosum sp. nov. from Asia (Hypodematiaceae), pp. 99-106 in Phytotaxa 524 (2) on pages 100-103, DOI: 10.11646/phytotaxa.524.2.4, http://zenodo.org/record/564207
Polystichum xuansonense Li Bing Zhang, N. T. Lu & Liang Zhang 2023, sp. nov.
No full text<i>Polystichum xuansonense</i> Li Bing Zhang, N.T.Lu & Liang Zhang, <i>sp. nov.</i> (Figs. 3 & 4). <p> <b>Type:—</b> VIETNAM. Phu Tho Province: Tan Son District, Xuan Son Commune, Xuan Son National Park, limestone mountain, 21° 7’58.11” N, 104°55’41.16” E, elev. ca. 345 m, 27 November 2013, <i>Li Bing Zhang, Liang Zhang & Ngan T. Lu</i> 6565 (holotype VNMN!; isotypes CDBI!, MO).</p> <p> <i>Diagnosis:—</i> This species is somewhat similar to <i>Polystichum excellens</i> Ching (1958: 234) in having oblong-lanceolate pinnae, but the former has middle pinnae with undulate to bluntly dentate acroscopic margins, proximal margins of pinnae parallel to or overlapping the rachis, and rounded pinna apex, whereas the latter has middle pinnae with low obtuse teeth or nearly repand acroscopic margins, proximal margins of pinnae forming an angle of 15–30° with the rachis, and acute pinna apex.</p> <p>Plants medium-sized, evergreen, (13–) 35–45 cm tall. Rhizomes erect, ca. 1.5 cm long, ca. 1.2 cm in diam.; roots brown blackish when dried, up to 20 cm long, ca. 0.5 mm in diam. Fronds 9–14 per rhizome, 10–43 cm; stipe brown, 4.5–10 cm long, ca. 1.0 mm in diam., basal stipe scales brown, membranous, lanceolate-ovate, 0.2–1.1 × 2.2–4.1 mm, margins entire, apex short acuminate; distal petiole scales lanceolate, subulate, 0.2–0.5 × 1.0– 2.12 mm, membranous, margins subentire to irregular dentate, apex long-acuminate or caudate. Laminae 1-pinnate, linear-lanceolate, 18–35 cm long, 2.3–4.5 cm wide, apex acuminate; rachises ca. 1 mm in diam., stramineous, adaxially sulcate; abaxially and adaxially with subulate scales, membranous, light brown, margins long outward, apex long-caudate. Pinnae 17–32 pairs, alternate, attached at 70° (–90°) angles to rachis, separate from each other, 0.6–1.2 cm distant (between two adjacent points), acroscopic auriculate; basalmost pinnae rhombic-ovate, 0.5–1.2 × 2.0–6.0 mm, shortly stalked, 2 basal pairs ca. 0.5 mm apart, apices acute or obtuse, bases obviously asymmetrical, acroscopic margins blunt dentate, basiscopic margins entire; middle pinnae largest, oblong-lanceolate, 0.4–0.7 × 1.3–2.5 cm, shortly stalked, bases cuneate, proximal margins parallel to or overlapping the rachis, acroscopic margins undulate to bluntly dentate, basiscopic margins entire or slightly dentate upward, apices rounded; adaxially glabrous, abaxially sparsely covered with linear light brown microscales; frond texture papery; venation pinnate, distinct abaxially, slightly distinct adaxially, lateral veins nearly reaching pinna margin. Sori small, terminal on lateral veins of fertile pinnae, 1.1–1.4 mm in diam., closer to margins than to midrib, 1–12 on acroscopic side and 1–5 on basiscopic side, centers ca. 2 mm apart from one another; indusia present, light brown, entire.</p> <p> <b>Etymology:—</b> The species epithet is from Xuan Son, the name of the national park in northern Vietnam, where the new species was discovered.</p> <p> <b>Distribution:—</b> This species is currently known to be endemic to the type location.</p> <p> <b>Notes</b>:—Both <i>Polystichum xuansonense</i> and <i>P. excellens</i> occur in northern Vietnam and the latter is common in limestone areas in Cao Bang, Ha Giang, and Hoa Binh provinces (Lu <i>et al.</i> 2014a) but not found in Phu Tho Province where the former was discovered. <i>Polystichum xuansonense</i> is quite rare and was found only in one small location in relatively dry forest with about 30 individuals. It might occur elsewhere and more explorations are needed.</p> <p> Our unpublished DNA data shows that <i>P. xuansonense</i> might be closely related to <i>P. dielsii</i> Christ (1906: 238), but the two are morphologically quite different from each other: <i>P. xuansonense</i> has oblong-lanceolate pinnae, whereas <i>P. dielsii</i> has oblong pinnae. The latter occurs in China and Vietnam (Zhang & Barrington 2013).</p>Published as part of <i>Lu, Ngan Thi, Zhang, Liang, Thanh, Nguyen Trung, Toan, Le Chi & Zhang, Li-Bing, 2023, Three new species and one new record of the fern genus Polystichum (Dryopteridaceae) from Vietnam, pp. 85-94 in Phytotaxa 607 (1)</i> on pages 89-90, DOI: 10.11646/phytotaxa.607.1.7, <a href="http://zenodo.org/record/8212241">http://zenodo.org/record/8212241</a>
Acid-base cooperativity of heterogeneous catalyst containing acidic framework and sterically hindered base for aldol condensation
No full textA bifunctional heterogeneous catalyst containing two mutually incompatible acidic and basic sites, which exhibits cooperative catalytic behavior in the aldol condensation of acetone and various aldehydes, was synthesized by postgrafting of 1,5,7-triazabicyclo[4.4.0] dec-5-ene (TBD, a sterically hindered organic base) onto Al-MCM-41 molecular sieve. (C) 2009 Xiao Bing Lu. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved
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