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

Publication Title

Systematic Botany

Volume Number

36

Issue Number

4

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

Geographic Subject

China

Document Type

Article

Language

English

Notes

Systematic Botany, Vol. 36, no. 4 (2011-10-01).

Identifier

SFS0046430_00001

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