in Mohr & al., Mycol. Res., 108: 529, 2004. Basionym: Arthopyrenia foveolata A.L. Sm. - J. Bot., London, 49: 43, 1911.
Synonyms: Arthopyrenia gyalectoides M. Knowles ex A.L. Sm.; Pyrenocollema foveolatum (A.L. Sm.) C. Mohr
Distribution: N- VG. S - Pugl (Nimis & Tretiach 1999 as C. halodytes),
Description: Thallus crustose, endosubstratic and hardly distingushable from the substrate, forming 0.5-1 cm wide, grey-beige patches often edged with a minutely embossed rim. Perithecia scattered, black, totally immersed and not protruding, hardly visible to the naked eye as minute black dots 0.1-0.2 mm diam. Perithecial wall dark brown, more or less cellular; hamathecium of branched and anastomosed pseudoparaphyses, the hymenial gel I-. Asci 8-spored, ovoid to subcylindrical, I-, bitunicate and fissitunicate, with an ocular chamber. Ascospores hyaline, oblong, 1-septate, one cell usually longer than the other, 14-21 x 5-9 µm. Pycnidia black, immersed. Photobiont cyanobacterial (Hyella). Spot tests: all negative. Chemistry: no lichen substances.
Note: probably this is the most common species of the genus along the Italian coasts, where it most often occurs on barnacles; in the past, it has been frequently confused with C. halodytes (e.g. all records of that species from the Trieste coast refer to C. foveolatum).