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Type: Article
Published: 2023-01-31
Page range: 15–26
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Cyrtomium calcis sp. nov. and six new records of the shield fern family (Dryopteridaceae) from Vietnam

Department of Biology, Vietnam National Museum of Nature, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam
Shanghai Chenshan Botanical Garden, Shanghai 201602, China
Du Gia Special Use forest management board, Bac Me, Hagiang Province, Vietnam
Department of Botany, Hanoi Pedagogical University 2, 32 Nguyen Van Linh, Xuan Hoa, Phuc Yen, Vietnam
Missouri Botanical Garden, 4344 Shaw Blvd., St. Louis, Missouri 63110, U.S.A.; Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, Sichuan 610041, China
Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan 650201, China
Pteridophyte Arachniodes Cyrtomium IUCN limestone flora new discovery Polystichum


We describe a new species of Cyrtomium, C. calcis, from northern Vietnam and southern China, and report new records of six species in two fern genera, Arachniodes and Polystichum, of Dryopteridaceae, i.e., Arachniodes amabilis (from Lamdong Province), A. amoena (Quangtri Province), A. fengii (Nghean Province), A. globisora (Thanhhoa, Quangtri, and Laocai provinces), and A. nigrossora (Vinhphuc Province), and Polystichum ariticulatipilosum (Hagiang Province). The new species of Cyrtomium most closely resembles C. pachyphyllum, but can be distinguished from the latter in the shape of petiole scales, number of lateral pinna pairs, venation, and lamina shape. Detailed description, images, notes, type information, examined specimens, distribution, and habitat are provided for the new species and new records. The status of the new species is provisionally assessed here as endangered (EN) following the IUCN Categories and Criteria.


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