The lichen genus Hypogymnia in southwest China

A total of 36 species of Hypogymnia are known from southwestern China. This region is a center of biodiversity for the genus. Hypogymnia capitata, H. nitida, H. saxicola, H. pendula, and H. tenuispora are newly described species from Yunnan and Sichuan. Olivetoric acid is new as a major lichen substance in Hypogymnia, occurring only in H. capitata. A key and illustrations are given for the species known from this region, along with five species from adjoining regions that might be confused or have historically been misidentified in this region.