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Polystichum quangbinhense sp. nov. (subg. Haplopolystichum; Dryopteridaceae), the southernmost cave species of Polystichum from central Vietnam

NGAN THI LU, LIANG ZHANG, DUNG THAI NGUYEN, LI-BING ZHANG

Abstract


A new fern species, Polystichum quangbinhense, a member of P. subg. Haplopolystichum (Dryopteridaceae), is described and illustrated from Quang Binh Province in central Vietnam. It is the southernmost cave species of the genus discovered so far. Polystichum quangbinhense is most similar to P. obliquum in having oblong pinnae, but the two can be distinguished from each other by the morphology of pinna margins. Polystichum quangbinhense was found inside a karst cave at an elevation of 120 m with humid and shady conditions and is currently known from two populations occurring at two sides of the Doi Cave (So Dua Cave), Quang Binh Province, central Vietnam, and is classified as Critically Endangered (CR) following IUCN Red List criteria.


Keywords


Quang Binh, karst cave, Polystichum quangbinhense, Vietnam, Pteridophytes

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DOI: http://dx.doi.org/10.11646/phytotaxa.283.3.6

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ISSN 1179-3155 (print); ISSN 1179-3163 (online)

Published by Magnolia Press, Auckland, New Zealand