THE LICHEN GENUS STAUROTHELE IN NORTH-AMERICA

Seventeen species of Staurothele are reported from North America. Of these S. effigurata Thoms., S. orispruinosa Thoms., S. rugosa Thoms., and S. verruculosa Thoms. are new to science. The description of S. lecideoides Bouly de Lesd. is emended. A key to species, descriptions, maps, photographs, and discussions are provided. Extensive synonymies combine a number of previously reported species. The shape of the hymenial algae is not accepted as a taxonomic criterion.