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