Cololejeunea zangii (Hepaticae, Lejeuneaceae), a new epiphyllous species from China

Chlorocolea R. M. Schust., a small epiphyllous subgenus of the genus Cololejeunea (Hepaticae, Lejeuneaceae), hitherto comprised eight species. It is well characterized and easily recognized by the delicate plants, sigmoid marginal cells of the leaf lobe, and greatly reduced leaf lobules. Cololejeunea zangii R. L. Zhu and M. L. So, an additional species of this subgenus from China, is described as a species new to science. C. zangii primarily differs from other members of this subgenus by the absence of gynoecial innovations. A key is provided for all known species of subg. Chlorocolea.