On the occurrence of Riccia atromarginata Levier and R. boliviensis Jovet-Ast (Ricciaceae: Marchantiophyta) in the Western Ghats of India

Riccia atromarginata, a species of broad distribution known from Africa, America, Europe and Asia, was recently collected in the Sirumalai Hills of Southern Western Ghats in Peninsular India and is the first record for the country. The earlier report of this species made by Karadakatti et al. (2023) from the Western Ghats of Karnataka is incorrect. Examination of their herbarium specimen UASB-5452 was found to contain two species—R. boliviensis and the common R. billardierei. Riccia boliviensis, a new record for the Western Ghats, is also reported here. A detailed description of R. atromarginata with images and a distribution map are provided for the indigenous population.