Circinaria leprosescens  

Thallus cracked-areolate, scurfy or mealy, areoles variably developed and usually slightly convex, later ascending at the edges and resembling minute folioles, squamules or papillae, at times appearing granular, isidiate or sorediate, pale white-grey to dark blue-grey, later brown-grey. Prothallus sometimes evident, dark green-grey, delimiting.
Anamorph: conidiomata pycnidia black, gnarled, the conidia filiform, curved, ca 25 μm long.
Teleomorph: ascomata apothecia, often absent, 1-2 per areole, 0.3-1 mm diam., round, at first deeply concave, later emergent. Thalline margin thin, often granular or not obvious, mostly paler than the thallus. Disc black. Asci (4-)8-spored. Ascospores 14-30 × 7-16 μm, broadly ellipsoidal, aseptate, hyaline, thin- and smooth-walled, without a gelatinous sheath or epispore.
Chemistry: thallus K–, Pd– (aspicilin).

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