Umbilicaria Torrefacta
''Umbilicaria torrefacta'' is a species of saxicolous lichen, saxicolous (rock-dwelling), foliose lichen in the family Umbilicariaceae. It is an arctic-alpine species with a circumpolar distribution and is widely distributed within the Holarctic realm, specifically within the Palearctic and Neoarctic biogeographical regions. Characteristic features of ''Umbilicaria torrefacta'' include the lace-like fringe in its and the plates on the underside of the thallus. One common name, punctured rock-tripe, refers to the distinctive sieve-like perforations on the thallus margins. The species was species description, scientifically described in 1777 by John Lightfoot (biologist), John Lightfoot and later classified under the genus ''Umbilicaria'' by Heinrich Schrader (botanist), Heinrich Schrader in 1794. Because of its somewhat variable morphology (biology), morphology, this species has often been misidentified historically and described under different names, resulting in an extensiv ...
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