Radula (Radulaceae, Marchantiophyta) in India with three new additions from Arunachal Pradesh in Eastern Himalaya

Three East and South-east Asian species of the genus Radula Dumort., viz. R. chinensis Steph., R. kojana Steph. and R. sumatrana Steph. are newly reported for the Indian bryoflora, from Arunachal Pradesh in Eastern Himalaya. Asexual reproduction through caducous leaves is described for the first time in R. sumatrana. Descriptions and illustrations of the three species based on Indian material are presented. A key to the Indian species of Radula is provided.