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This aquatic Verrucaria has a brown, cracked thallus, prominent discs (perithecia) forming convex projections and large spores (27 x 11.5ųm) with a perispore (a feint halo around the spore). It is a species of shaded streams and shallow ravines. In my experience it is a species of siliceous rocks, slates especially. In Ireland, the species is only known from one site in Connemara, County Galway and from County Leitrim. It is probably under-recorded.
Original text submitted by Vince J. Giavarini