579 research outputs found
Palynology of Amphidium Schimp. (Amphidiaceae M. Stech): can spore morphology circumscribe the genus?
No full textABSTRACT Amphidium Schimp. is characterized by cushion-forming erect primary stems, linear-lanceolate leaves, and gymnostome capsules. The phylogenetic position of Amphidium is uncertain, with the genus having been variously included in Zygodontaceae Schimp., Rhabdoweisiaceae Limpr., Orthotrichaceae Arn. and Amphidiaceae M. Stech. A palynological investigation was performed of the three species of the genus that occur in the Americas: Amphidium lapponicum (Hedw.) Schimp., Amphidium mougeotii (Bruch & Schimp.) Schimp., and Amphidium tortuosum (Hornsch.) Cufod. Spores were observed and measured for greatest diameter under light microscopy both before and after acetolysis. Non-acetolyzed spores were observed under scanning electron microscopy to assess surface ornamentation of the sporoderm. All spores observed were smaller than 20 µm and heteropolar, with surface ornamentation reflecting a combination of different elements, such as gemmae, rugulae and perforations. The palynological characteristics observed here suggest that the genus Amphidium, and thus its contained species, be placed in their own family.</div
Palynology of Amphidium Schimp. (Amphidiaceae M. Stech): can spore morphology circumscribe the genus?
No full textABSTRACT Amphidium Schimp. is characterized by cushion-forming erect primary stems, linear-lanceolate leaves, and gymnostome capsules. The phylogenetic position of Amphidium is uncertain, with the genus having been variously included in Zygodontaceae Schimp., Rhabdoweisiaceae Limpr., Orthotrichaceae Arn. and Amphidiaceae M. Stech. A palynological investigation was performed of the three species of the genus that occur in the Americas: Amphidium lapponicum (Hedw.) Schimp., Amphidium mougeotii (Bruch & Schimp.) Schimp., and Amphidium tortuosum (Hornsch.) Cufod. Spores were observed and measured for greatest diameter under light microscopy both before and after acetolysis. Non-acetolyzed spores were observed under scanning electron microscopy to assess surface ornamentation of the sporoderm. All spores observed were smaller than 20 µm and heteropolar, with surface ornamentation reflecting a combination of different elements, such as gemmae, rugulae and perforations. The palynological characteristics observed here suggest that the genus Amphidium, and thus its contained species, be placed in their own family
Dicranodontium Bruch, Schimp. et Guemb.
No full text2. Dicranodontium Bruch, Schimp. et Guemb.Bryol. Eur. 1:159. 1847. Much resembling Campylopus: and differing mainly in the linear, upper leaf cells and the deeply divided peristome teeth. Type species: D. longirostre (Web. et Mohr) Bruch, Schimp. et Guemb. (Didymodon longirostris Web. et Mohr). Dicranodontium pulchroalare Broth.Trans. Linn. Soc. London Bot. ser. 2. 6: 89. l90l. Type specimens: McConnell & Quelch 345, 346, British Guiana (K). The type specimens have been collected on Mount Roraima, British Guiana, at circa 2500 m. One of the specimens (345) has straight leaves on laxly foliate stems; the other specimen has stems more densely foliate, with rather strongly falcate leaves.Published as part of P. A. Florschütz, 1964, Flora of Suriname, volume VI, part I, Leiden :Brill on page 8
Thuidium tamariscinum Schimp.
No full textThuidium tamariscinum (Hedw.) Schimp. − 2A, Forêt territoriale de Sant’Antone, tourbière de pente à végétation vasculaire dont l’association relève du Caricetum intricatae caricetosum, située dans un peuplement forestier de pin laricio et sapin dominant avec un sous étage de hêtre [NM157529], 1270 m, 11.9.2013, Pioli, A. s.n. (Hb. CBNC). Espèce rare, signalée à Bastia et Bonifato (CAMUS, 1895).Published as part of Pioli, Achille, 2015, Contribution à l'inventaire des bryophytes de corse: nouvelles données sur la présence de quelques espèces nouvelles, rares ou peu fréquentes, pp. 101-107 in Candollea 70 (1) on page 106, DOI: 10.15553/c2015v701a9, http://zenodo.org/record/568437
Homalothecium philippeanum (Spruce) Schimp. (Bryophyta) Ekstresinin Asetilkolinesteraz Enzim Aktivitesine Etkisi
No full textAmaç: Alzheimer hastalığı yaklaşık 50 milyon insanı etkileyen ve en sık görülen nörolojik bozukluktur. Kolinerjik hipoteze göre sinir iletiminden sorumlu asetilkolin konsantrasyonunun azalması hastalıkla ilişkilendirilmektedir. Asetilkolini metabolize eden asetilkolinesteraz enziminin inhibisyonunun hastalık seyrinde düzelmeye yol açtığı bilinmektedir. Bu nedenle bu çalışma, ilk kez karakterizasyonunu yapılan kara yosunu türü Homalothecium philippeanum (Spruce) Schimp. ekstresinin asetilkolinesteraz enzim inhibisyon etkisini araştırmayı amaçlamaktadır. Yöntem: Homalothecium philippeanum (Spruce) Schimp. ekstresi süperkritik akışkan (CO2) ekstraksiyon yöntemiyle 180 bar basınç, 50 °C sıcaklıkta ve kosolvent olarak %5 (v/v) etanol kullanılarak Superex F-500 (Türkiye) cihazında elde edilmiş olup GK/KS analizi Schimadzu GCMS-QP 2020 sisteminde wax kolon kullanılarak yapılmıştır (RESTEK Rtx-Wax kolon, 30m x 0,25mm x 0,25 ?m film kalınlığı). Ekstrenin düşük, orta ve yüksek dozlarının asetilkolinesteraz enzim inhibisyon etkisini belirlemek için Ellman ve ark. (1961) tarafından oluşturulan spektrofotometrik yöntem küçük modifikasyonlarla değiştirilerek uygulanmıştır. Bulgular: Homalothecium philippeanum (Spruce) Schimp. ekstraktının düşük düzeyde anti-Alzheimer aktivite gösterdiği tespit edilmiştir. Sonuç: Elde edilen veriler ışığında Homalothecium philippeanum (Spruce) Schimp.’in düşük düzeyde anti-Alzheimer etki gösterdiği saptanmış olup söz konusu etkinin tam olarak anlaşılması ve ticari ürün haline dönüştürülebilmesi için daha ileri araştırmalarla etken madde tespiti ve izolasyonunun yapılması gerekmektedir
Cinclidotus aquaticus Bruch & Schimp.
No full text<i>Cinclidotus aquaticus</i> (Hedw.) Bruch & Schimp. <p> SPECIMEN. — <b>Austria</b>. Upper Austria: Piesslingursprung, 760 m a.s.l., 27.IX.2003, Kučera (CBFS[CBFS 11079]; <b>MK031725</b>, <b>MK031717</b>).</p>Published as part of <i>Kiebacher, Thomas, Lüth, Michael, Lüth, Volker & Kučera, Jan, 2019, Morphological and molecular evidence for synonymy of Cinclidotus confertus Lüth with C. riparius (Host ex Brid.) Arn., pp. 259-269 in Cryptogamie, Bryologie 20 (20)</i> on page 269, DOI: 10.5252/cryptogamie-bryologie2019v40a20, <a href="http://zenodo.org/record/7999944">http://zenodo.org/record/7999944</a>
Homalothecium philippeanum Schimp.
No full textHomalothecium philippeanum (Spruce) Schimp. − 2B, Forêtde San Petru d’Accia; surle chemind’accèsau sommet du San Petrone, versant ouest [NM 258945], dans la hêtraie, sur rocher, à végétation vasculaire du Poo-Fagetum sylvaticae, 10.7.2011, Pioli, A. (Hb. privé 20110701003); 2B, Forêt communale de Sant’Andrea di Bozio [NM254820], 1020 m, hêtraie, talus le long de la piste forestière, dans une touffe de Neckera complanata sur racine de hêtre, végétation vasculaire dont l’association relève du Poo-Fagetum sylvaticae, 9.12.2012, Pioli, A. (Hb. privé 20121209005); 2A, Forêt territoriale de Marmanu, en bordure du chemin de randonnée GR20, zone humide provenant des divagations d’un petit torrent, cortège floristique vasculaire relevant du Valeriano-Adenostyletum briquetii, dans une hêtraie [NM133528], 1430 m, 3.10.2013, Pioli, A. s.n. (Hb. CBNC). Espèce rare en Corse, signalée sur le San Petrone (SOTIAUX et al., 2007, 2008).Published as part of Pioli, Achille, 2015, Contribution à l'inventaire des bryophytes de corse: nouvelles données sur la présence de quelques espèces nouvelles, rares ou peu fréquentes, pp. 101-107 in Candollea 70 (1) on page 105, DOI: 10.15553/c2015v701a9, http://zenodo.org/record/568437
Characterization of the complete mitochondrial genome of the moss, Myurella julacea (Schwägr.) Schimp. (Bryidae, Theliaceae)
No full textThe present study reports the complete mitochondrial genome of Myurella julacea (Schwägr.) Schimp. (GenBank accession number MT850126); the genome size was 104,979 bp. The gene arrangement was found to be similar to that in other bryophytes, and the genome consisted of 40 protein-coding genes (PCGs), 3 ribosomal RNAs (rRNAs), and 24 transfer RNAs (tRNAs). The phylogenic relationship was analyzed by construction of a phylogenetic tree based on the mitogenome of M. julacea and 25 other bryophytes publicly available in GenBank. The complete mitogenome of M. julacea is expected to provide insights into the evolution of species belonging to the order Hypnales
Bryum barnesii Schimp.
No full text* Bryum barnesii J.B.Wood ex Schimp. SPECIMEN EXAMINED. — Falkland Islands. East Falkland, North Arm Farm, 52°7’26.4”S, 59°21’50.4”W, rock cliffs opposite settlement, 2 m a.s.l., 12.I.2015, 15/806 (MNH). NOTES New to the southern hemisphere. The collection closely matches northern hemisphere material (Spence 2014). This species along with Bryum dichotomum Hedw. tend to be more widespread than other species in the complex, most of which prefer Mediterranean-type climates. The bulbils are smaller than those in B. dichotomum, and generally there are 2-5 per leaf axil. The species has also recently been found in Magallanes Province of Chile in Tierra del Fuego (pers. comm.). Possibly introduced. A strict bipolar/South American species restricted to southern South America.Published as part of Spence, John R., 2022, Studies in Austral Bryaceae (Bryopsida). IV. New records from the Falkland Islands (Islas Malvinas), with a phytogeographic analysis of the family, pp. 211-224 in Cryptogamie, Bryologie 20 (15) on page 213, DOI: 10.5252/cryptogamie-bryologie2022v43a15, http://zenodo.org/record/782252
<i>Sphagnum lindbergii </i>Schimp. : une nouvelle espèce de sphaigne pour la flore ibérique
No full textSphagnum lindbergii Schimp., une espèce de mousse à distribution circumpolaire, est recensée pour la première fois en Espagne et dans la péninsule ibérique. Cette découverte, réalisée dans les sources d’eau ferrugineuse de la vallée de Chistau (Pyrénées centrales), s’ajoute à la seule population pyrénéenne actuellement connue, limitée à la vallée française du Rioumajou. La population espagnole comprend quatre petites parcelles couvrant une surface estimée à 5 m². Nous décrivons sa morphologie, en mettant l’accent sur les caractères diagnostiques, et son habitat, caractérisé par des eaux riches en fer dans des environnements subalpins acides. La population est confrontée à des menaces importantes, notamment le piétinement du bétail et le changement climatique, ce qui a conduit à la classer dans la catégorie « en danger critique d’extinction » (CR) selon les critères de l’UICN. La mise en place de mesures de conservation sont fortement recommandées étant donné son extrême rareté dans les Pyrénées.Sphagnum lindbergii Schimp., a moss species of circumpolar distribution, is reported for the first time in Spain and in the Iberian Peninsula. This discovery, made in the chalybeate springs in the Chistau Valley (Central Pyrenees), adds to the only Pyrenean population currently known, limited to the French Rioumajou Valley. The Spanish population comprises four small patches occupying an estimated 5 m². We describe its morphology, emphasizing diagnostic traits, and its habitat, characterized by iron-rich flushes in acidic, sub-alpine environments. The population faces significant threats, including livestock trampling and climate change, prompting its classification as Critically Endangered (CR) following IUCN criteria. Conservation measures are urgently recommended given its extreme rarity in the Pyrenees.</p
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