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Issue: Vol. 283 No. 3: 7 November 2016
Type: Correspondence
Published: 2016-11-07
DOI: 10.11646/phytotaxa.283.3.6
Page range: 295–299
Abstract views: 29
PDF downloaded: 1

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

Chengdu Institute of Biology, Chinese Academy of Sciences, P.O. Box 416, Chengdu, Sichuan 610041, China and Department of Botany, Vietnam National Museum of Nature, Vietnam Academy of Science and Technology, 18th Hoang Quoc Viet Road, Cau Giay, Ha Noi, Vietnam
Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan 650201, China
Department of Science and International Cooperation, Phong Nha-Ke Bang National Park, Son Trach, Bo Trach, Quang Binh, Vietnam
Missouri Botanical Garden, P.O. Box 299, St. Louis, Missouri 63166-0299, U.S.A.
Quang Binh karst cave Polystichum quangbinhense Vietnam Pteridophytes

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.