This taxon is characterized by its occurrence on the shells of Limpets. The perithecia with a diameter of 0.5-1 mm are deeply sunk into the substrate (but not in a hole) and relatively not protruding, numerous pycnidia in the form of large black dots on the surface of the substrate. Spores according to our measurements: (17) 18-22 x (7) 8-10 µm. Almost always with Collemopsidium foveolatum forme sur Patelle.