Distribution: N - TAA. S - Si (Grillo & al. 2007).
Description: Thallus crustose, mostly endosubstratic and hardly distingushable, but sometimes reaching the surface as small dark brown flecks. Perithecia scattered, black, subconical to globose, sessile to half-immersed, often depressed dear the ostiole, 0.15-0.5 mm across. Involucrellum absent; perithecial wall dark brown, more or les cellular; hamathecium of richly branched and anastomosed pseudoparaphyses, the hymenial gel I-. Asci 8-spored, elongate-clavate to subpyriform, I-, bitunicate and fissitunicate, with an ocular chamber. Ascospores hyaline, ovoid to ovoid-fusiform, 1-septate but sometimes with additional pseudosepta, one cell usually longer than the other, 20-30(-33) x (7.5-)8.5-12 µm. Pycnidia black, immersed. Photobiont cyanobacterial (Hyella). Spot tests: all negative. Chemistry: no lichen substances.
Note: a species with a mostly endolithic thallus (forming dark brown thin patches only on non-calcareous rocks), and with more or less sessile ascomata, found on steeply inclined to vertical surfaces of permanently damp or moist limestones or base-rich siliceous rocks; widely distributed in the Holarctic region, but not common.
Source: Keissler K. von 1938. Pyrenulaceae, Mycoporaceae, Coniocarpineae. In: Rabenhorst G L: Kryptogamen-Flora von Deutschland, Österreich und der Schweiz. 2nd, IX, Die Flechten, Abt. 1, 2. Gebr. Borntraeger, Leipzig, pp. 1-846.