The lichen genera Lasallia and Umbilicaria in East Africa

Abstract

Three species of Lasallia Mérat and nine species of Umbilicaria Hoffmann are reported from the East African mountains, their vegetative propagules, chemistry, ecology, and distribution are discussed and keys to them are provided. The new combinations Umbilicaria africana (Jatta) Krog & Swinscow, U. soralifera (Frey) Krog & Swinscow, and U. umbilicarioides (B. Stein) Krog & Swinscow are made. Umbilicaria bolusiana Frey, U. haumaniana Frey and U. propagulifera (Vainio) Llano are reduced to synonymy with U. umbilicarioides , and U. glauca var. ruwenzoriensis Frey to synonymy with Lasallia papulosa (Ach.) Llano.