113,717 research outputs found
Huperzia tubulosa (Maxon) B. Ollg.
No full textCosta Rica, Unknown, Zapote de San Carlos. LAT (); LONG (); ALT (1500)
Phlegmariurus foliaceus (Maxon) B. Øllgaard 2012
No full text. Phlegmariurus foliaceus (Maxon) B. Øllgaard (2012b: 15) . Fig. 9 Lycopodium foliaceum Maxon (1912: 1).— Urostachys foliaceus (Maxon) Nessel (1939: 68).— Huperzia foliacea (Maxon) Holub (1985: 72). TYPE:— PANAMÁ, Chiriquí: Humid forest along the upper Caldera River, near »Camp 1« Holcomb’s trail, above El Boquete, 1450–1650 m, 22–24 Mar 1911, Maxon, W. R. 5628 (AAU, GH, US). Erect from an ascending base, up to 50 cm tall, sparsely branched. Shoots homophyllous, almost equally thick throughout, 15–30 mm in diam. incl. leaves, sometimes tapering upward. Stems excl. leaves 2–4 mm thick near the base, somewhat ridged by decurrent leaf bases. Leaves uniform throughout, borne in alternating whorls of 4–5, these 2–4 mm apart, wide-spreading to somewhat reflexed, usually straight, not twisted at the base, oblong-elliptic to oblanceolate from a narrow long-cuneate base, apiculate, 6–17 × 1.5–3.5 mm, almost flat, with prominent vein above, or folded slightly down along the vein, papery to subcoriaceous, with slightly revolute, apically denticulate margins. Leaf bases often red-dotted; sporangia (1.5–) 2 (–2.5) mm wide. Distribution:— Costa Rica, Panamá. Narrowly endemic. Habitats:—Epiphytic in wet forest. 1050–1900 m elev. Specimensstudied:— BocasdelToro:Forest near headwaters of Río Culebra, ca. 5 km ENE of Cerro Pate Macho, E of Finca Serrano, 1160 m, Hammel 6145 (MO). Chiriquí: Upper Caldera river, near Camp I, Holcomb’s Trail, above El Boquete, 1450–1650 m, Maxon 5623a (US), 5628 (AAU, C, US). Along Road Gualaca–Fortuna Dam site, at 10.1 mi NW of Los Planes de Hornito, 1260 m, Antonio 4195 (MO). Road Fortuna Lake–Chiriquí Grande, 4.5–5 km N of dam over lake, 1100–1135 m, Croat 59945 (MO). La Fortuna Hydroelectric project, 1200 m, Hammel 2195 (MO). Fortuna Dam region, Along Quebrada Arena, 1050 m, McPherson 8733 (MO). Bajo Chorro, near Río Caldera, 1900 m, Skog et al. 4064 (MO, US). Near Boquete, trail from Bajo Chorro along the Río Caldera, 2.5 km from trailhead, 1700 m, W. Testo 1000 (PMA, VT).Published as part of Øllgaard, Benjamin & Testo, Weston, 2021, --- The- -- Lycopodiaceae- -- of- -- Panamá, pp. 1-66 in Phytotaxa 526 (1) on pages 23-26, DOI: 10.11646/phytotaxa.526.1.1, http://zenodo.org/record/572318
Phlegmariurus watsonianus (Maxon) B. Øllgaard 2012
No full text<p> <b>0.­­­</b> <b> <i>Phlegmariurus watsonianus</i> ­­­</b> (Maxon) B. Øllgaard (2012b: 20). Fig. 19A</p> <p> <i>Lycopodium watsonianum</i> Maxon (1912: 3).— <i>Huperzia watsoniana</i> (Maxon) B. Øllgaard (1992: 701). Type:— PANAMÁ, Chiriquí, Upper Caldera River, near Camp I, Holcombs Trail, above El Boquete, 1600 m, Mar. 1911, <i>Maxon 5712</i> (US 676223 holotype).</p> <p> Flaccidly pendulous, slender, at least up to 35 cm long. Shoots homophyllous or almost so, equally thick throughout, 5–10 mm in diam. incl. leaves in basal divisions, sometimes tapering to ca 5 mm. Stems excl. leaves 0.5–0.8 mm thick. Leaves borne in alternating, irregular whorls of 3–4, these 1–1.5 mm apart, spreading to ascending, or rarely loosely appressed in terminal divisions, usually twisted at the lamina base, straight to slightly upward curved, linear to linearsubulate, with distinctly widened, subauriculate, usually strongly revolute, often overlapping lamina bases, 4–6 (–9) <i>×</i> 0.4–0.6 mm just above the auriculate base, usually ca. 0.3 mm wide in the middle, with obscure to prominent vein, with the auricles irregularly toothed. Sporangia 0.7–1 mm wide.</p> <p> <b>­­­ Distribution</b>:— El Salvador to Panamá.</p> <p> <b>­­­ Habitats</b>:—Epiphytic in humid forest, 1900–2500 m elev.</p> <p> <b>­­­ Notes</b>: Closely related to <i>Phlegmariurus sarmentosus</i> (Spring) Trevisan (Andes), but smaller in all parts.</p> <p> <b>­­­ Specimens­­­studied</b>:— <b>Bocas­­­del­­­Toro</b>: Headwaters of Río Colubre, 2400–2500 m, <i>Gómez et al. 22401</i> (MO). Valle de Silencio, Forest, <i>Antonio 1652</i> (MEXU, MO, PMA). <b>Chiriquí</b>: Above Guadalupe, ca 2 km N of Cerro Punta, 2200 m, <i>Maas & Dressler 4895</i> (U, Z). Parque Internacional La Amistad, bajada hacia la cascada, <i>Araúz & Villareal 775</i> (PMA). Above Cerro Punta, ca 2 mi E of Guadalupe, along Río Chiriquí Viejo, <i>McAlpin 1450</i> (F, MO). Bugaba, Cerro Punta, 2200 m, <i>van der Werff & Herrera 6452</i> (MO). Cerro Punta, <i>Florpan, RA 2969</i> (PMA). Vicinity of Bajo Chorro, 1900 m, <i>Woodson & Schery 690</i> (AAU, GH, MO, US).</p>Published as part of <i>Øllgaard, Benjamin & Testo, Weston, 2021, The Lycopodiaceae of Panamá, pp. 1-66 in Phytotaxa 526 (1)</i> on pages 44-45, DOI: 10.11646/phytotaxa.526.1.1, <a href="http://zenodo.org/record/5723180">http://zenodo.org/record/5723180</a>
Phlegmariurus tubulosus (Maxon) B. Øllgaard 2012
No full text2. Phlegmariurus tubulosus (Maxon) B. Øllgaard (2012b: 19) . Fig. 18B Lycopodium tubulosum Maxon (1913: 178).— Urostachys tubulosus (Maxon) Nessel (1939: 177).— Huperzia tubulosa (Maxon) B. Øllgaard (1992: 697). Type:— COSTA RICA: Pacayas, at the foot of the volcano Turrialba, 1400 m, Dec. 1908, Biolley 17398, US holotype). Urostachys costaricensis Herter, (1958: 83).— Lycopodium costaricense (Herter) Morton (1964: 72). Type:— COSTA RICA: without special locality, Mar. 1908, Robert Ridgeway s.n. (US 861.309). Pendent, slender, 15–40 cm long. Shoots gradually heterophyllous, tapering from ca 10–25 mm in diam. incl. leaves at the base, to 3–5 (–7) mm distally, sometimes only slightly tapering. Stems excl. leaves 1–1.5 (–2) mm thick at the base. Leaves usually gradually modified, borne in irregular, alternating whorls of 3 (or 4), these 1.5–2 (–3) mm apart; leaves of basal divisions spreading to ascending or loosely appressed, often twisted to a vertical position, linear-lanceolate to linear-oblanceolate, 9–15 × 1–2 mm, almost flat or somewhat concave adaxially, softly to firmly herbaceous, with flat or slightly revolute, entire margins. Leaves of middle and distal divisions usually gradually shorter, narrower and more appressed, conform, or abaxially convex, with involute margins. Leaves of fully sporangiate divisions 6-ranked, with a widened, clasping base, often contracted into a short to long, narrow, involute apex, 2–5 × 1–1.5 mm. Sporangia 1–1.2 mm wide. Distribution:— Costa Rica, Panamá. Habitats:—Epiphytic in montane forest, 1000–2100 m elev. Notes:—Closely related to Phlegmariurus taxifolius, and differing mainly in its smaller size. Intermediate specimens occur, making the distinction of the species difficult. Specimensstudied:— Chiriquí: Road Gualaca–Fortuna Dam site, 5.9 mi NW of Los Planes de Hornito, 1370 m, Croat 49886 (MO). Upper Caldera River, near Camp I, Holcomb’s Trail, above El Boquete, 1450–1650 m, Maxon 5717 (US). Los Siguas Camp, S slope of Cerro de la Horqueta, 1700 m, Maxon 5430 (US). Cerro Horqueta, Cord. de Talamanca, above Boquete, 1750–2100 m, Cochrane 6284 (MO). Near El Boquete, 1000–1500 m, Cornman 941, 1163 (US), 1221 (US, UC). Bajo Chorro, Boquete Distr., 1830 m, Davidson 341 (F, MO, US). Cerro Horqueta, 8 km NW of Boquete, montane forest, N slopes, 1800 m, Maas & Dressler 4966 (U). Palo Alto, 4.5 mi NE of Boquete, along trail to Cerro La Trompeta, 1770 m, Hammel 2139 (MO). Near Boquete, trail from Bajo Chorro along the Río Caldera, 2.5 km from trailhead, 1700 m, W. Testo 989 (PMA, VT). NE del campamento de Fortuna (hornito), sitio de presa 1000–1200 m, Correa et al. 2887 (PMA).Published as part of Øllgaard, Benjamin & Testo, Weston, 2021, --- The- -- Lycopodiaceae- -- of- -- Panamá, pp. 1-66 in Phytotaxa 526 (1) on page 42, DOI: 10.11646/phytotaxa.526.1.1, http://zenodo.org/record/572318
Huperzia watsoniana (Maxon) B. Ollg.
No full textEl Salvador, Santa Ana, El Trifinio Cordillera Miramundo, mountain of Montecristo. LAT (14°24'59'' N); LONG (89°21'21'' W); ALT (2000 - 2200). "Moist cloud forest. Epiphyte on Persea tree in wet forest. Coll. Jan. 27-31, 1966.
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Huperzia taxifolia (Maxon) B. Ollg.
No full textHonduras, El Paraiso, El Paraiso, El Paraiso Camino de El Paraíso a Las Dificultades. LAT (13°47'35'' N); LONG (86°30'42'' W); ALT (). Veg. Remanentes de bosque nebuloso. Eífita
Inquiry into the interlocution of students engaged with mathematics: appreciating links between research and practice
No full textFor either to be useful, links between research and practice are critical. Just as important are connections between the practice of students engaged in mathematical activity and research that seeks to understand that practice. This research report explores lessons that researchers and practitioners can learn from an inquiry into the interlocution of students working collaboratively in small groups when engaged in talking and listening to each other. We use the term interlocution to denote discursive practices of learners in conversational exchanges. Questions that motivate this research included the following. What discursive practices do interlocutors employ as they work collaboratively to understand and resolve mathematical tasks? How do these practices influence the growth of their mathematical ideas? In what ways do their discursive practices help them move from a contextualized, situated task to generalize the task or their solution? Do students' discursive practices assist them to connect and generalize ideas from a new problem to others on which they have worked?Powell, A. B., & Maher, C. A. (2002). Inquiry into the interlocution of students engaged with mathematics: Appreciating links between research and practice. In D.S. Mewborn, P. Sztajn, D.Y. White, H.G. Wiegel, R.L. Bryant & K. Nooney (Eds.), Proceedings of the twenty-fourth annual meeting of the North American Chapter of the International Group for the Psychology of Mathematics Education (Athens, Georgia) (Vol. 1, pp. 317-329). Columbus, OH: ERIC Clearinghouse for Science, Mathematics, and Environmental Education
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Maxon and roton measurements in nanoconfined He
No full textWe investigate the behavior of the collective excitations of adsorbed He in an ordered hexagonal mesopore, examining the crossover from a thin film to a confined fluid. Here we present the inelastic scattering results as a function of filling at constant temperature. We find a monotonic transition of the maxon excitation as a function of filling. This has been interpreted as corresponding to an increasing density of the adsorbed helium, which approaches the bulk value as filling increases. The roton minimum exhibits a more complicated behavior that does not monotonically approach bulk values as filling increases. The full pore scattering resembles the bulk liquid accompanied by a layer mode. The maxon and roton scattering, taken together, at intermediate fillings does not correspond to a single bulk liquid dispersion at negative, low, or high pressure
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