Polystichum fengshanense, sp. nov. (sect. Haplopolystichum, Dryopteridaceae) from Karst Caves in Guangxi, China based on Morphological, Palynological, and Molecular Evidence
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Publication Date
October 2011
Abstract
A new fern species, Polystichum fengshanense , is described and illustrated from nine karst caves in northern Guangxi, China. It is a member of Polystichum sect. Haplopolystichum (Dryopteridaceae). A phylogenetic analysis based on chloroplast trnL-F sequences suggests that the new species is most closely related to P. cavernicola, P. minutissimum, and P. speluncicola, species described from karst caves in adjacent southern Guizhou. Morphologically, P. fengshanense can be easily distinguished from these three species by having narrow-type microscales on the abaxial laminar surface, sessile pinnae, and sori closer to the midrib. Palynologically, P. fengshanense has granulate perispore sculpturing, whereas P. cavernicola has verrucate perispore sculpturing and P. speluncicola has cristate perispore sculpturing with numerous spinules. Polystichum fengshanense is considered to be critically endangered (CR) based on IUCN red list criteria because of its restricted distribution.
Keywords
Cave Flora, Dryopteridaceae, Guangxi, Polystichum Fengshanense, Phylogeny, Sect. Haplopolystichum, Spore Morphology, Trnl-F Sequence
Document Type
Article
Notes
Systematic Botany, Vol. 36, no. 4 (2011-10-01).
Identifier
SFS0046430_00001
Recommended Citation
Zhang, Li-Bing and He, Hai, "Polystichum fengshanense, sp. nov. (sect. Haplopolystichum, Dryopteridaceae) from Karst Caves in Guangxi, China based on Morphological, Palynological, and Molecular Evidence" (2011). KIP Articles. 4217.
https://digitalcommons.usf.edu/kip_articles/4217