Weddellomyces epicallopisma  

Anamorph: not known.
Teleomorph: ascomata perithecia, scattered or in small clusters, 250-350 µm diam. and 300-400 µm tall, ± globose to conical; strongly erumpent, the cortical layers of the host lichen splitting and often becoming reflexed; black, opening at the apex by an irregular gaping pore to ca 50 µm diam. Peridium black, with patches of completely occluded tissue separated by paler radially arranged dark brown thick-walled elongate cells, apparently fracturing along these lines of weakness when the ascoma is over-mature. Interascal tissue of pseudoparaphyses, persistent, branched and anastomosing, cellular, 2.5-3 µm diam. Asci 125-160 x 18-20 µm, ± cylindrical to elongate-clavate, thick-walled and fissitunicate, with a small internal apical beak, not turning blue with iodine, 8-spored. Ascospores arranged biseriately,  (19-) 21-26.5 (-30) x 10-11.5 µm, ellipsoid to clavate, swollen above and tending to taper towards the base, (1-) 2- or 3-septate, constricted at the septa, golden brown, minutely and evenly verruculose (ornamentation within the wall layers), without a gelatinous sheath or appendages.

Map (c) British Lichen Society; click on map for latest version.