Mycelium growing between layers or groups of algal cells. Ascocarps solitary or gregarious, subglobose, immersed or erumpent, ostiolate, epapillate, coriaceous, top and base dark brown, sides hyaline or dark, ostiolar canal periphysate and with a turgid pulvillus. Paraphyses absent, centrum with or without a gelatinous matrix enclosing the asci. Asci 8-spored, clavate, pedunculate, unitunicate, at first thick-walled, finally deliquescing, developing along the inner wall of the ascocarp up to the ostiolar canal. Ascospores ellipsoid to ovoid, simple, colourless. Pycnidia solitary, subglobose, to lentiform, immersed, irregularly chambered, ostiolate, coriaceous, top and base brown, sides hyaline. Coniodiophores conical or cylindrical, simple. Conidia filiform or subglobose, simple, hyaline. Hosts: Marine algae (Chlorophyta).