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1.
A new taxonomic treatment is proposed for thePottia starckeana species complex. The peristome development is not considered to be a useful feature to separate the taxa. On the basis of spore morphology only two species are accepted:P. starckeana, with spores wavy in outline, andP. davalliana, with variously-shaped and developed processes on the spores.Pottia starckeana var.brachyoda is reduced to synonymy withP. starckeana; P. conica andP. commutata are treated as synonyms ofP. davalliana. The speciesP. mutica, P. affinis, P. salina, P. microphylla, P. texana, andP. arizonica (included var.mucronulata) are considered taxa of doubtful affinity, as they have spore features intermediate between the two spore types established for the group. The identity ofP. appertii andP. recurvifolia has not been elucidated because the type material has been destroyed. 相似文献
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Salman V Amann R Girnth AC Polerecky L Bailey JV Høgslund S Jessen G Pantoja S Schulz-Vogt HN 《Systematic and applied microbiology》2011,34(4):243-259
The colorless, large sulfur bacteria are well known because of their intriguing appearance, size and abundance in sulfidic settings. Since their discovery in 1803 these bacteria have been classified according to their conspicuous morphology. However, in microbiology the use of morphological criteria alone to predict phylogenetic relatedness has frequently proven to be misleading. Recent sequencing of a number of 16S rRNA genes of large sulfur bacteria revealed frequent inconsistencies between the morphologically determined taxonomy of genera and the genetically derived classification. Nevertheless, newly described bacteria were classified based on their morphological properties, leading to polyphyletic taxa. We performed sequencing of 16S rRNA genes and internal transcribed spacer (ITS) regions, together with detailed morphological analysis of hand-picked individuals of novel non-filamentous as well as known filamentous large sulfur bacteria, including the hitherto only partially sequenced species Thiomargarita namibiensis, Thioploca araucae and Thioploca chileae. Based on 128 nearly full-length 16S rRNA-ITS sequences, we propose the retention of the family Beggiatoaceae for the genera closely related to Beggiatoa, as opposed to the recently suggested fusion of all colorless sulfur bacteria into one family, the Thiotrichaceae. Furthermore, we propose the addition of nine Candidatus species along with seven new Candidatus genera to the family Beggiatoaceae. The extended family Beggiatoaceae thus remains monophyletic and is phylogenetically clearly separated from other related families. 相似文献
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Kurtzman CP 《Antonie van Leeuwenhoek》2005,88(2):121-130
Three new species of Candida and a new combination in the genus Hyphopichia are proposed from phylogenetic analysis of nucleotide divergence in domains D1/D2 of the large subunit (26S) rDNA. The new taxa and their type strains are the following: Candida bentonensis sp. nov. (NRRL YB-2364, CBS 9994), Candida hispaniensis sp. nov. (NRRL Y-5580, CBS 9996), Candida pseudorhagii sp. nov. (NRRL YB-2076, CBS 9998) and Hyphopichia heimii comb. nov. (NRRL Y-7502, CBS 6139), basionym Pichia heimii Pignal. Phylogenetic analysis placed C. pseudorhagii and H. heimii in the Hyphopichia clade whereas C. bentonensis and C. hispaniensis are members of the Yarrowia clade. 相似文献
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赖广辉 《热带亚热带植物学报》2013,21(1):1-10
在模式标本考证、居群调查和引种栽培的基础上,确认毛壳竹(Phyllostachys hispida S.C.Li,S.H.Wu et S.Y.Chen)与乌竹(P.varioauriculata S.C.Li et S.H.Wu)在新秆性状、秆箨颜色、箨舌高度及颜色、叶鞘毛被上有较大的区别,应作为独立的竹种看待。小叶光壳竹(P.varioauriculata var.glabrata G.H.Lai)也因新秆下部一段呈扁圆形、秆箨基部具长柔毛,叶片很小等特征而明显不同于乌竹,应提升为一个独立的竹种,但由于存在晚出同名问题而给出新名称P.microphylla G.H.Lai。同时还描述了毛壳竹的一新变种,即光壳竹(P.hispida var.glabrivagina G.H.Lai)。日本所产的姬淡竹与毛壳竹属于同一种系,因其学名P.humilis Muroi为一裸名,应予废弃。 相似文献
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Petra Hoffmann 《Brittonia》2008,60(2):136-166
Heterosavia (Phyllanthaceae) is segregated from Savia (tribe Bridelieae), recognized at generic rank, and placed in tribe Phyllantheae. Floral, fruit, leaf anatomical, leaf venation,
and pollen characters of the neotropical taxa previously united as Savia including Gonatogyne are discussed and illustrated. Keys to the three genera and to the species of Heterosavia are presented. Four species (all new combinations), Heterosavia bahamensis, H. erythroxyloides, H. laurifolia, and H. maculata, are recognized. The new combinations Heterosavia laurifolia var. intermedia and H. maculata var. clementis are proposed. The names Heterosavia, H. erythroxyloides, H. laurifolia, Savia clementis, S. clusiifolia, S. clusiifolia var. fallax, and S. longipes are lectotypified. Distribution maps and conservation assessments (IUCN ratings) of Heterosavia species and varieties are provided. 相似文献
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本文对中国已知肉杯菌属的六个分类单位作了描述,其中脑孢肉杯菌(Sarcoscypha cerebri formis)由于独特的孢子表面纹饰被定为新种,每一个种的子囊孢子的表面形态都作了扫描电镜研究,并提供了已知种的检索. 相似文献
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Species delimitation in Cystoderma and Cystodermella was evaluated based on ITS and LSU rDNA sequences as well as morphological data. Two species of Cystoderma are synonymised with C. carcharias and three species with C. jasonis, distinguishing the synonymised taxa as varieties of these accepted species. Analyses of partial LSU rDNA sequences revealed Cystoderma and Cystodermella as distinct monophyletic genera, with Ripartitella representing a well-supported sister group of the latter. Phaeolepiota aurea represents either an unsupported sister group or member of Cystoderma in the phylogenies based on LSU and ITS sequences rDNA data, respectively. The tribe Cystodermateae sensu Singer did not appear monophyletic according to analyses of LSU sequences. On the basis of these data, the phylogenetic relationships among most of the analyzed genera could not be resolved unequivocally. 相似文献
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报道了中国黄枝衣科(Teloschistaceae)的一中国新记录属粉黄衣属(新拟)(Xanthomendoza)和一中国新记录种漫粉黄衣(新拟)(Xanthomendoza ulophyllodes)及石黄衣属(Xanthoria)的一新记录种裂芽黄衣(新拟)(Xanthoria calcicola)。对漫粉黄衣的ITS序列进行了测定和系统发育分析,并对相关类群的形态和分子数据进行了讨论。对2新记录种的形态特征、生境与分布进行了详细描述,并提供了形态特征图。 相似文献
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Samuli Lehtonen 《Kew Bulletin》2008,63(4):525-563
Summary Taxonomy of the genus Echinodorus is partially revisited in the light of current understanding of the phylogenetic relationships of the genus. As a result
of new taxonomy, the species status of some previously synonymised taxa are restored, other names are synonymised, and some
nomenclatural problems unnoticed by previous authors are resolved. Two new species, Echinodorus reptilis and E. emersus are described. The subgeneric divisions of the genus are not accepted, and all subspecific taxa are either rejected or established
as species. As a result, 28 species based on a phylogenetic species concept are now recognised in Echinodorus and an identification key to these species is provided. 相似文献
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Navicula subtilissima was described by Cleve as a new species from ‘a dry rivulet at the shore of Imandra, at the foot of Chibinä, Lapland’. However, the examination of the type slides and the unmounted original material using transmission and scanning electron microscopy revealed that there are at least three finely striated similar taxa distinguishable at the specific level. From these taxa, application of the nameN. subtilissima Cleve is established by selecting a lectotype; a second one is described as a new species,N. parasubtilissima, and the third is identified asN. subtilissima var.micropunctata Germain. The last one warrants a specific status by its fine structural differences in having continuous striae consisting of a single elongate areola occluded by a hymen with perforations arranging hexagonally. The occurrence of these three species is shown in Japanese collections. 相似文献
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A preliminary account of Entolomataceae from Costa Rica is presented. Three new taxa are described, two inClitopilus, one inRhodocybe, and three new combinations are proposed inInocephalus. Five taxa ofClitopilus are reported for the first time from Costa Rica and a key to species is provided. Four species ofRhodocybe are discussed and a key to the six species known from Costa Rica is also provided.Alboleptonia earlei, Inocephalus murraii, Inocephalus quadratum, Rhodocybe incarnata andRhodocybe pseudonitellina are now known to occur in Costa Rica. 相似文献
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The fate of 15NH
inf4
sup+
and 15NOinf3− was followed in control and PO
inf4
sup3−
enriched 1570 l mesocosms filled with epilimnetic water from an oligotrophic Rocky Mountain lake. Volumetric incorporation
of 15NH
inf4
sup+
and 15NO
inf3
sup−
into phytoplankton and bacterioplankton (particulates between 280 and 0.7 μm), and crustacean zooplankton > 80 μm was enhanced
by PO
inf4
sup3−
, but no increase in biomass specific rates of uptake by phytoplankton and bacteria occurred for either form of 15N. Dilution of both 15NH
inf4
sup+
and 15NO
inf3
sup−
by 14NH
inf4
sup+
and 14NO
inf3
sup−
, respectively, was evident indicating regeneration of these nutrients, but regeneration rates were not effected by PO
inf4
sup3−
enrichment. The results illustrate the strong trophic coupling between N dynamics and PO
inf4
sup3−
enrichment in this system. 相似文献
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The morphologically remarkable endemic fauna within ancient lakes has received much attention in the literature. More inconspicuous taxa, however, often lack detailed molecular and morphometrical examination, although their proportion of the endemic fauna of an ancient lake must not be underestimated. Consequently, a better understanding of evolutionary patterns and processes within these lakes requires more knowledge about the often-neglected inconspicuous taxa. In the present study, we focus on the notoriously cryptic pea clam genus Pisidium (Bivalvia: Sphaeriidae). Though the genus is widely distributed, most endemic species are reported only from ancient lakes, including the European ancient sister lake system of Ohrid and Prespa on the Balkan Peninsula. Here we test for the first time hypotheses on the evolution of the endemic pea clams in this European biodiversity hotspot by molecular means. Combining a broad 16S phylogeny (comprising most European pea clam species), network analyses and morphometrical analyses, we found interesting biogeographical patterns and provide evidence for cryptic species in both lakes. Furthermore, we confirmed the proposed sister-species relationship of the endemics P. edlaueri in Lake Ohrid and P. maasseni in Lake Prespa, and we suggest scenarios of the endemic pea clam evolution within both lakes. The patterns of speciation found in the genus Pisidium are compared to patterns in morphologically distinct molluscan groups in lakes Ohrid und Prespa. 相似文献
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The genera Staurstrum Meyen and Staurodesmus Teil. (Desmidiacea) in Karnataka and Goa States (India)
We report 63 species of Staurastrum Meyen and one of Staurodesmus Teil. from 52 water bodies of Karnataka State and Goa region (1976–77). They include 9 new taxa. The majority are new to S. India. 相似文献
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André M. Amorim 《Brittonia》2003,55(2):127-145
Species of the anomalous-stemmed complex ofHeteropterys are revised after intensive fieldwork in eastern Brazil.Heteropterys patens (=H. anomala) is redefined, and three new species are described (H. admirabilis, H. imperata, andH. nordestina). In addition, this treatment provides brief synonymy, lectotypifications, illustrations, and comments for those four species, and a key to all taxa of the complex. 相似文献