Studies in the Lichen Family Physciaceae. VII. The New Genus Physciella

Abstract

Physciella, a new genus in the lichen family Physciaceae, is described and compared to its closest relatives. A combination of characters, including its prosoplectenchymatous, pale lower cortex, its lack of atranorin in the upper cortex, and its short, ellipsoid conidia, distinguish it from Physcia and Phaeophyscia. Four species, Ph. chloantha, Ph. denigrata, Ph. melanchra, and Ph. nepalensis are currently placed in the new genus.