Cyrtomium lacrimipinnum (Dryopteridaceae), a new sexually reproducing fern from Phong Nha–Ke Bang National Park, Vietnam

Authors: Yoneoka, Katsuhiro Country: Vietnam DOI: 10.3897/phytokeys.275.183837 Published: Jan. 1, 2026 Source: PhytoKeys OpenAlex: View in OpenAlex

Collection: Pensoft Publishers

Keywords: Chloroplast DNA · Topics: Fern and Epiphyte Biology, Lichen and fungal ecology, Bryophyte Studies and Records

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A new fern species, Cyrtomium lacrimipinnum (Dryopteridaceae), is described and illustrated from limestone ridges of Phong Nha–Ke Bang National Park, central Vietnam. It is most similar to C. pachyphyllum in having lateral pinnae with deeply cordate bases but is distinguished by its pinnae with acute and attenuate apices (vs. obtuse) and the presence of black or dark brown microscales on both surfaces of the pinnae (vs. confined to the abaxial surface). Spore counts of 64 per sporangium suggest a sexual reproductive mode.

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