Anamorph: not known.
Teleomorph: stromata absent. Ascomata perithecia, 150-250 µm diam., scattered or in large clusters, subglobose to pyriform, becoming erumpent through the host thallus, with a shortly papillate, hardly or partially exposed neck, ostiolate, black. Peridium carbonaceous, comprising 3-6 layers of radially compressed thick-walled dark brown angular cells. Interascal tissue absent, the ostiole lined internally with periphyses. Asci in a basal fascicle, forming in a gelatinized matrix, 40-45 x 20-28 µm [measured in water], clavate to cylindric-clavate, with a markedly thickened apex when young, fissitunicate, not staining in iodine, 8-spored. Ascospores biseriately arranged, 8-9.5 (-10.5) x 5-6.5 µm, broadly ellipsoidal, the ends rounded, hardly constricted at the single ± median septum, dark brown, smooth- and thick-walled, without an epispore, gelatinous sheath or appendages.
Not evaluated by Woods & Coppins (2012), but listed as Nationally Rare.
Parasitic in thalli of Porpidia species, not causing significant necrosis.
Scattered throughout the Scottish Highlands, with on record in VC70 Cumberland. BLS map here.