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Type: Article
Published: 2018-11-08
Page range: 277–290
Abstract views: 19
PDF downloaded: 1

Validation of Hymenasplenium laterepens (Aspleniaceae): evidence from morphology and molecular analyses

College of Life Sciences and Environment, Hengyang Normal University, Hengyang 421008, Hunan, China
Makino Herbarium, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
Makino Herbarium, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
College of Life Sciences and Environment, Hengyang Normal University, Hengyang 421008, Hunan, China
Institute of Ecology and Geobotany, Yunnan University, Kunming 650091, Yunnan, China
Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun 666303, Yunnan, China
taxonomy chromosome number DNA sequencing Hymenasplenium unilaterale Hymenasplenium apogamum reticulate evolution Pteridophytes

Abstract

The name Hymenasplenium laterepens was first proposed by Cheng and Murakami in 1998 but was not validly published. We recently collected and studied this taxon at its locus classicus in Xishuangbanna, Yunnan Province in China. Molecular phylogenetic analyses and morphological observation of H. laterepens and related species clearly indicate that this is a distinct taxonomic entity worthy of species rank. Phylogenetically, H. laterepens is closely related to H. apogamum and may be involved in the reticulate evolution of the H. apogamum complex, which is comprised of several taxa with different levels of ploidy. Morphologically, H. laterepens is distinguished by the combination of its triangular laminae, large pinnae with acute apices and deeply serrated margins, and ca. 117 chromosomes at meiosis I and 32 spores in each sporangium. This work provides a complete species description and comparison to related species within the genus Hymenasplenium, particularly to other relatives of the “H. unilaterale” group. Hymenasplenium laterepens is described here with diagnosis and type designation.