Physcia dakotensis

Physcia dakotensis is a species of saxicolous (rock-dwelling) foliose lichen in the family Physciaceae. It was formally described as new to science in 2004, based on specimens collected from granitic rock in South Dakota, USA. The lichen forms small, tightly appressed, leaf-like thalli with narrow gray lobes that produce distinctive coarse, upright soredia, and it was initially mistaken for the eastern North American species P. subtilis. It is distinguished by its highly fissured morphology, poorly developed lower...