An account of the liverwort genus Porella in Thailand with a new record, P. obtusata var. macroloba and the occurrence of asymmetrical underleaves associated with left-right symmetry in the genus

An updated checklist of twelve taxa of Porella in Thailand is presented, based on literature and some recent collections. Of these, P. obtusata var. macroloba is reported new for Thailand. The variety possesses asymmetrical underleaves associated with left-right symmetry, the first report of this character in the genus Porella . A description and illustration of P. obtusata var. macroloba are provided.