Lecanora viridiatra  

Thallus pale yellowish green, areolate, medulla I–; areoles flat to convex, 300-800 µm diam; prothallus distinct, black, often coating the sides of the areoles.

Anamorph: conidiomata pycnidia, immersed in areoles, black. Conidia 20-29 × 0.5 μm, curved.

Teleomorph: ascomata apothecia, 300-800 µm diam, black, immersed, later convex, with thin, dark brown exciple; epithecium olive brown-green to dark bluish; hypothecium hyaline. Asci Lecanora type. Ascospores 11-15 × 5-7 μm. 

Chemistry: Thallus C–, K+ faintly yellow, Pd–, UV+ pink (usnic acid).