A synopsis of the species of Cyathea (Cyatheaceae-Polypodiopsida) with pinnate to pinnate-pinnatifid frond
A synopsis of the species of Cyathea (Cyatheaceae-Polypodiopsida) with pinnate to pinnate-pinnatifid frond
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羽状至羽状羽状半裂叶桫椤属（Cyatheaceae-Polypodiopsida）物种简介
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发表时间：
2012
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通讯作者：
M. Lehnert
中科院分区：
文献类型：
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作者：
M. Lehnert
摘要介绍了羽状至羽状羽状羽状叶的狭叶Cyathea sensu strictu种。所有的物种都是严格的新热带物种，在西半球的整个属范围内都有发现，但大多数物种出现在南美洲北部和中美洲的山区。这个人为划分的类群包括以前被认为是分离属的蛇麻属物种，它们与以前不被认为是蛇麻属的一些物种一起在Cyathea中形成一个单系类群。这一类群的特征是一般没有毛，软骨层状纹理，叶柄鳞片有白色边缘或全白色，大的孢子囊直径≥1mm，每个孢子囊30-40个。具有至少三个大的赤道孔的线虫型孢子在这一组中占主导地位，但既不普遍也不专属于它。剩下的羽状到羽状羽状羽状羽状羽状种包括主要的膨化种，具有中等到密集的柔毛层和相对较小的sori，直径≤1mm，每个sorus±20个孢子囊。提出了12个新组合，并提出了以下3个新名称：Cyathea cnemidaria (= cnemidaria tryoniana)， C. glandulifera (= Cn。C. suprapilosa (= Cn。suprastrigosa)。提供了所有羽状至羽状羽状叶的Cyathea种的钥匙。混血儿不接受治疗。
A summary of the species of Cyathea sensu strictu with pinnate to pinnate-pinnatifid fronds is presented. All species are strictly Neotropical and are found throughout the entire range of the genus in the Western Hemisphere, but most species occur in the mountainous regions of northern South America and Central America. This artificially delimited group includes the species formerly recognized as the segregate genus Cnemidaria , which form a monophyletic group within Cyathea together with some species previously not recognized as Cnemidaria . This group is characterized by a general lack of hairs, cartilaginous laminar texture, petiole scales that have white margins or that are completely white, and large sori with diameter ≥ 1 mm and 30–40 sporangia per sorus. Cnemidaria -type spores with at least three large equatorial pores dominate in this group but are neither omnipresent nor exclusive to it. The remainder of the pinnate to pinnate-pinnatifid species of Cyathea includes predominantly exindusiate species that have moderately to densely pilose laminae and relatively small sori with diameter ≤ 1 mm and ± 20 sporangia per sorus. Twelve new combinations are made and the following three new names are proposed: Cyathea cnemidaria (= Cnemidaria tryoniana ), C. glandulifera (= Cn. glandulosa ), C. suprapilosa (= Cn. suprastrigosa ). A key to all species of Cyathea with pinnate to pinnate-pinnatifid fronds is provided. Hybrids are not treated.