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Crustaceous lichen with dark grey to pale gray thallus, rimose to rimose-areolate, thin, ±continuous, even absent. The apothecia are common, black, lecideine; 0.3-0.4 mm in diam., with thin margin, rarely persistent, soon excluded. The disc is black, epruinose, plane, soon becoming convex.
Spotted on granite and quartz rocks forming part of the wall of an old stone house.
Camera Model: NIKON D300. Exposure Time: 1/60 sec.; f/32; ISO Speed Rating: 200. Focal Length: 90.0 mm. Flash fired