Anamorph: no information available.
Teleomorph: ascostromata developing in large clusters in host thallus areoles or apothecia; perithecial, 65-75 µm diam., ± globose , black, the upper half erumpent, ostiolate. Peridium 6-8 µm thick, composed of 3-4 layers of irregular compressed cells 4-6 µm diam., in the upper half dark brown to black with heavily melanized walls, in the lower half pale brown with somewhat thinner walls. Interascal tissue not seen. Asci 20-25 x 10-11.5 µm, pyriform, ± sessile, thick-walled and fissitunicate with a distinct ocular chamber, 8-spored. Ascospores arranged biseriately or in a fascicle, 9-10.5 x 3.5-4 µm ((10-) 11.5-12.5 (-14) x (3-) 3.5-4 µm fide Hawksworth et al. 2010), cylindric-ellipsoidal to narrowly clavate with rounded ends, not markedly constricted at the ± median septum, hyaline, thin-walled, smooth, without an epispore, gelatinous sheath or appendages.
Not evaluated. Listed as Nationally Rare by Woods & Coppins (2012) but probably overlooked.
Parasitic on the thallus and apothecia of Toninia sedifolia, not causing significant necrosis.
Scattered throughout western and northern Britain.