• Collemopsidium sublitorale (Leight.) Grube & B.D. Ryan
Collemopsidium sublitorale
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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 5-10ųm. Calcareous rocks and shells but is much under-recorded in Ireland.

Key characteristics

  • 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

 Simms, M. J., (2016). Collemopsidium sublitorale (Leight.) Grube & B.D. Ryan. [In] LichenIreland. Accessed on 2018-08-16.