crust lichen, on hardwood bark THALLUS: pale gray to white, minutely wrinkled, v rimose, black prothallus, v thin, K+ weak yellow slowly turning red, C-, KC- MEDULLA: white ALGAE: green APOTHECIA: lecideine, black, to 1 mm, convex, thin prominant smooth black rim, rough-shiny, colorless to yellowish (in K at least) narrow (60 m) hymenium, dark brown hypothecium, dark brown epihymenium SPORES: 8 per ascus, brown, ellip, 2 cells, thin even walls and septum, smooth, 13-14 x 6-7 m