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21 October 2021 New species or infraspecific variation? A case study of Ptychanthus striatus var. motuoensis var. nov. (Marchantiophyta: Lejeuneaceae) from Xizang, China
Zun Dai, Shi-Chen Xing, S. Robbert Gradstein, Xing Chen, Rui-Liang Zhu, Jian Wang
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Abstract

An unusual specimen of the genus Ptychanthus (Lejeuneaceae) was collected in Xizang, differing from the common P. striatus in the perianth, having only five, wing-like keels (one dorsal, two lateral and two ventral), the lateral and ventral keels being sharper than the dorsal one. Molecular-phylogenetic analysis of chloroplast and nuclear DNA sequences showed that the plant was deeply nested within P. striatus. As the differences in perianth structure could not be attributed to plasticity, we interpret the phylogenetic position of the plant as the result of a recent speciation process and describe it as a new variety, P. striatus var. motuoensis.

Copyright ©2021 by The American Bryological and Lichenological Society, Inc.
Zun Dai, Shi-Chen Xing, S. Robbert Gradstein, Xing Chen, Rui-Liang Zhu, and Jian Wang "New species or infraspecific variation? A case study of Ptychanthus striatus var. motuoensis var. nov. (Marchantiophyta: Lejeuneaceae) from Xizang, China," The Bryologist 124(4), 475-483, (21 October 2021). https://doi.org/10.1639/0007-2745-124.4.475
Received: 11 April 2021; Accepted: 20 July 2021; Published: 21 October 2021
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KEYWORDS
incongruence
morphology
perianth
phylogeny
Ptychanthoideae
Ptychanthus striatus
species concept
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