Heterodermia pindurae (Physciaceae) - a new foliose lichen from Rwanda

The new species Heterodermia pindurae, found in the Nyungwe and Volcanoes National Parks in Rwanda, is described and illustrated. It differs from the morphologically similar H. subcomosa and H. pellucida in the minute, only 0.3–0.6 cm long thallus, blackish cilia, lack of laciniae, the pedicellate, cup-like apothecia with sorediate margins and production of norstictic acid. Key Words: Heterodermia pindurae, H. subcomosa, H. pellucida, new species, Nyungwe National Park, Volcanoes National Park, taxonomy