Coniocarpon cuspidans (Nyl.) Moen, Frisch & Grube

     Crustose thallus barely visible because buried in the bark, whitish, whitish-greenish, sometimes with a grey-purple hypothallus. Arthonioid apothecia very variable: lirelliform, elliptical, etc... often united to form star-shaped patterns, 0.4-0.8 x 0.1-0.3 mm, sometimes more or less edged with purple-brown or blackish-brown, rarely with whitish pruinose masses. Ascospores oblong to clavate, hyaline to slightly brownish at maturity, (2) 3 (4) septate, the apical cell larger, 16-18 x 7-8 µm. Photobiont: trentepohlia. Apothecia: K+ purple (Anthraquinones), thallus: C-, K-, KC-, P-. Species coming on trees with smooth bark (Corylus) from very humid places (often peat bogs).

_ Species close to Coniocarpon fallax but without red-orange bloom.