Recent progresses of knowledge on Riccia diversity in Cape Verde islands are briefly surveyed. The occurrence of two remarkable Riccia species in this archipelago is examined, and their overall distribution is presented.
Riccia atropurpurea Sim and R. congoana Steph. are noteworthy liverwort species, here reported for the first time for Cape Verde islands, from specimens collected in Fogo island. Main diagnosing characters and those of related taxa, habitat preferences, illustrations, scanning electron micrographs and updated ranges of the species are presented.