Description: Records of this seashore lichen are sparse (County Mayo and one from the east coast), possibly as a result of confusion with the common barnacle-shell lichen C. halodytes. Distinguishing between them hinges on whether the thallus is superficial and visible or immersed and, therefore, inapparent. In C. sublitorale it is the latter: the thallus is hidden from view. The spherical discs (perithecia) can be protruding or semi-immersed. The spores are simple: 15-25 x 5-10&

371;m. Calcareous rocks and shells but is much under-recorded in Ireland.

Key Identification Features:

• Seashore lichen similar to C. halodytes but with thallus hidden from view
• It colonises calcareous rocks and sea shells, especially barnacles and limpets.

Original text submitted by Vince J. Giavarini

Distribution Map from NBN: Collemopsidium sublitorale at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Collemopsidium sublitorale at iNaturalist World Species Observations database.