Thallus pale or grey, sparse to absent, usually of scattered granules or largely immersed in the bark, occasionally minutely rimose. Photobiont chlorococcoid.
Anamorph: not known.
Teleomorph: ascomata apothecia, 200-400 (-500) µm diam., convex, appressed, ± scattered, white to pale yellow or pink-brown, translucent when wet. Thalline exciple absent, true exciple poorly developed. Epithecium indistinct, hyaline, not granular. Hymenium (50-) 65-70 μm tall, hyaline. Hypothecium 35-65 μm tall, hyaline, composed of interwoven yellowish hyphae. Interascal tissue of paraphyses 1-1.5 μm diam., in a gel matrix, rarely branched, ± flexuose. Asci 50-55 × 20-22 μm, clavate to saccate, rather short-stalked, the wall many-layered, apical dome K/I+ blue, inner cap K/I+ intense blue, outer wall less intensive blue, 100(-150)-spored. Ascospores 4-4.5 (-5) μm diam., spherical, aseptate, hyaline, quite thick-walled, smooth, without an epispore or gelatinous sheath.
Chemistry: lichen substances not detected by TLC.
Assessed by Woods & Coppins (2012) as Vulnerable (D1). It is listed as Nationally Rare, and is included in Section 2(4) of the NC (Scotland) Act 2004.
SW England (Devon, Somerset), Wales (Cardiganshire), Scotland (Argyll, Perthshire, Skye, Speyside). BLS map here.
Amongst mosses on bark of Corylus and Populus tremula, also rarely on Fraxinus and Quercus.