Published April 2, 2026
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Asplenium paucipinnatum (Aspleniaceae), a new fern species from southern Thailand, based on morphological and molecular data
Authors/Creators
- 1. Nanjing Forestry University, Nanjing, China
- 2. Chulalongkorn University, Bangkok, Thailand
- 3. Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
- 4. Yunnan University, Kunming, China
- 5. Missouri Botanical Garden, St. Louis, United States of America
Description
Asplenium paucipinnatum, a new fern species from Nakhon Si Thammarat, Thailand, is described. Morphologically, it closely resembles A. micantifrons in having short-creeping and radial rhizome steles, 1-pinnate laminae, deeply incised pinnae on the basiscopic margin, and sori arranged in two rows close to the costae. However, A. paucipinnatum is readily distinguished by having fewer lateral pinnae (< 14 pairs), obliquely rhombic pinnae with acute apices and obtuse marginal teeth, contrasting the more numerous pinnae (> 15 pairs), lanceolate pinnae with acuminate apices, and acute teeth in A. micantifrons. Phylogenetic analyses based on multiple plastid DNA regions (atpB, rbcL, rps4, rps4-trnS, trnL, and trnL-F) support A. paucipinnatum as a distinct lineage, forming a sister relationship with a clade containing A. lepturus and A. contiguum. The combination of morphological and molecular evidence supports the recognition of this new taxon. Ecological notes, geographic distribution, and a comparison with related species are also provided.
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Additional details
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