Thallus crustose, thin or lacking, to minutely squamulose, microphylline, scattered to ± contiguous, green to olivaceous or brownish, cortex pseudoparenchymatous. Photobiont green, . Perithecia emergent, black or brownish, scattered among squamules, spherical to subpyriform, matt or slightly shining, smooth, or slightly roughened, wall 3-layered, an outer pseudoparenchymatous pigmented zone merging into a similar non-pigmented zone on inner side of which a ± developed layer of conglutinate, unbranched hyphae projects downwards towards centre of perithecium. Paraphyses absent. Asci clavate, ellipsoid or ovoid, thin-walled, 2- or 8-spored. Ascospores colourless, muriform.