Three taxa of pyrenocarpous lichens from the Sonoran Region are described as new: Placidium lacinulatum var. erythrostratum is characterized by a reddish medullary layer and broadly ellipsoidal ascospores. It is known from Arizona, California, and Mexico. Placopyrenium insuetum from Mexico is recognized by its rosulate, brown, epruinose thallus. Verrucaria rubrocincta, yet known only from Arizona and Mexico, is characterized by an endolithic thallus and a reddish pigmented, dimidiate involucrellum.
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1 December 2000
New Taxa of Pyrenocarpous Lichens from the Sonoran Region
Othmar Breuss
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The Bryologist
Vol. 103 • No. 4
Winter 2000
Vol. 103 • No. 4
Winter 2000