Two new rheophytic species of Schistidium (Grimmiaceae) from China

摘要: Two new species of Schistidium Bruch & Schimp., S. riparium H.H.Blom, Shevock, D.G.Long Ochyra, and mucronatum are described illustrated. They occur in rheophytic habitats China, the southern Hengduan Mountains Yunnan Province (Lancang Jiang Nu catchments) from further north, on Qinghai–Tibet Plateau Sichuan Qinghai Provinces (Jinsha Huang He catchments). The affinities discussed basis their concave broadly canaliculate leaves with plane erect margins, is tentatively placed Schimp. subgen. Canalicularia whereas account its keeled, ovate-lanceolate strongly curved twisted peristome teeth resembles very much sect. Apocarpiformia (Kindb.) Ochyra within Apocarpa Vilh.