Verrucaria maura on littoral fringe rock
|Marine Habitat Classification for Britain and Ireland Version 97.06
|Bedrock or stable boulders and cobbles in the sublittoral fringe is typically covered by a band of the black lichen Verrucaria maura. It occurs below the yellow and grey lichen zone (YG) and above communities of barnacles and fucoid algae. This biotope occurs in a wide range of wave exposures. Several variants are defined. On exposed shores Verrucaria spp. may occur with sparse barnacles (Chthamalus spp. or Semibalanus balanoides) (Ver.B). Where the ephemeral red alga Porphyra umbilicalis occurs this should be recorded as Ver.Por. More sheltered shores tend to lack these species (Ver.Ver).
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