Riccia mamrensis, a new species from Western Cape, South Africa

A new Riccia species, R. mamrensis Perold, from Western Cape, South Africa, is described. It is referred to subgenus Riccia. Details of the morphology of the thallus and of the scales, as well as sections of the branches and the ornamentation of the spores are provided. Also included are two figures: the first one with line drawings of the thalli, three cross sections of thallus branches, as well as some rows of upper thallus cells, and a scale; the second figure shows a set of SEM micrographs of the spores.