Polystichum perpusillum (sect. Haplopolystichum, Dryopteridaceae), a New Fern Species from Guizhou, China

Publication Type:Journal Article
Year of Publication:2012
Authors:ZHANG, LI-BING, He, H
Journal:Annales Botanici Fennici
Volume:49
Issue:1-2
Date Published:2012
ISBN Number:0003-3847
Abstract:

Polystichum perpusillum L.B. Zhang & H. He, a new fern species of Polystichum sect. Haplopolystichum (Dryopteridaceae), is described and illustrated from the entrance to a karst cave in southern Guizhou, China. A phylogenetic analysis based on the chloroplast trnL-F sequences shows that it is phylogenetically isolated in the section with no close relatives. Morphologically, it is similar to P. minutissimum, but P. perpusillum has an acute lamina apex, up to 12 pairs of pinnae per lamina, and deltoid-ovate or ovate-lanceolate rachis scales, while P. minutissimum has a round lamina apex, 5?8 pairs of pinnae per lamina, and subulate or linear rachis scales. Polystichum perpusillum has a granulate sculpture with Verrucae on its perispore, a sculpture rare in the genus. The species is considered to be critically endangered.Polystichum perpusillum L.B. Zhang & H. He, a new fern species of Polystichum sect. Haplopolystichum (Dryopteridaceae), is described and illustrated from the entrance to a karst cave in southern Guizhou, China. A phylogenetic analysis based on the chloroplast trnL-F sequences shows that it is phylogenetically isolated in the section with no close relatives. Morphologically, it is similar to P. minutissimum, but P. perpusillum has an acute lamina apex, up to 12 pairs of pinnae per lamina, and deltoid-ovate or ovate-lanceolate rachis scales, while P. minutissimum has a round lamina apex, 5?8 pairs of pinnae per lamina, and subulate or linear rachis scales. Polystichum perpusillum has a granulate sculpture with Verrucae on its perispore, a sculpture rare in the genus. The species is considered to be critically endangered.

URL:http://dx.doi.org/10.5735/085.049.0109
Short Title:Annales Botanici Fennici
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