Parmelia Saxatilis Lichen
Parmelia saxatilis, (L.) Fr.Habit and habitat.-On rocks.
Vegetative organs (thallus).-Greenish or ashen-gray above (sometimes reddish) somewhat ornamented with a fine network and with shallow depressions; black beneath with dense hairs (rhizoids) reaching the margin, much cleft with narrow lobes, with margins wavy and bordered with a fine white beading ( soredia) .
Fruiting organs (apothecia). -Chestnut border (thalline exciple), rather thick, somewhat evenly notched.
Spores.-Simple, ellipsoid, colourless.
Name.-The specific name saxatilis, the Latin for "rock," refers to the habitat.