Arthonia invadens Coppins

     Thallus included in that of its host, smooth surface or with rare altered soralia coming from the host because this species inhibits the production of soralia from its host, whitish, dirty whitish. Apohecia in groups, linear or star-shaped, black-brown, blackish, powderless. Ascospores colorless, 2-3-septate with a larger cell at one end. C-, K-, KC-, Pd-. Rare parasitic species of Schizotrema quercicola in humid oceanic forests.