Western Shield Lichen

Parmelia hygrophila is a corticolous (bark-dwelling) foliose lichen in the Parmelia saxatilis group, described in 1983 from the Pacific Northwest of North America. It was segregated from material that had often been folded into a broad concept of P. saxatilis. The species is characterised by its greyish-green, leafy thallus that produces abundant tiny outgrowths called isidia along the lobe margins and upper surface for reproduction. It grows in the humid forests of the Pacific Northwest, growing on...