Hyperphyscia

Hyperphyscia is a genus of lichen-forming fungi in the family Physciaceae. These lichens form tightly attached, leaf-like crusts that spread outward in rosettes, with individual lobes radiating in shallow, overlapping tiers that are seldom more than a millimetre or two wide and range in colour from pale brownish-grey to dark brown. They reproduce through brown, disc-shaped fruiting bodies that sit directly on the upper surface and contain thick-walled brown ascospores divided by a single cross-wall, typical of many members of their family....read more on Wikipedia.