Studies in the genus Riccia (Marchantiales) from southern Africa. 16. R. albomarginata and R. simii, sp. nov.

Abstract

A description of Riccia albomarginata Bisch. ex Krauss, augmented with the aid of new collections which most closely match the relevant fragments of the type material, is presented. The type collection comprises two species. The fragments that I consider to be in closest agreement with Krauss’s protologue are selected as lectotype. As far as could be established the rest of the type material is probably referable to R. concava Bisch. As previously mentioned by Perold (1989b), Sim (1926) and subsequent authors had applied the name * R. albomarginata' to a different taxon. This taxon, R. albomarginata auct. non Bisch., is now described and illustrated as  R. simii, sp. nov. Its distribution and ecology are also noted.