Thallus immersed, occasionally superficial to 35 μm thick, effuse, pale to dark grey, often tinged green. Hyphae K/I–. Anamorph: conidiomata pycnidia, frequent, 80-100 μm diam., brown, the wall orange- to red-brown, K+ pale purple. Conidia 3-4.5 × 0.5-1 μm, bacilliform to narrowly ellipsoidal, straight or slightly curved, hyaline, aseptate, without an epispore, gelatinous sheath or appendages. Teleomorph: ascomata apothecia, (0.1-) 0.2-1.5 mm diam., rounded, flat to slightly convex, red-brown to brown-black, often slightly glossy, resembling spots of tar; in section 55-70 μm tall, ± uniformly orange-brown, K+ dull pale purple. Epithecium indistinct. Hymenium 25-35 μm tall. Hypothecium 30-40 μm tall. Interascal tissue of pseudoparaphyses 0.5-1 (-1.5) μm diam., not swollen or pigmented at the apices, which are often embedded in a thin, clear gel-like layer. Asci 50-65 x 28-35 µm, broadly clavate to almost globose, nearly sessile, very thick-walled, 8-spored. Ascospores arranged in a fascicle, 7-11 × 3-4 μm, ovoid to clavate, 1-septate, the septum ± median, hyaline, thin-walled, smooth, without an epispore, gelatinous sheath or appendages. Chemistry: lichen products not detected by TLC.