Yellow and grey lichens on supralittoral rock
|Within Vocab||Marine Habitat Classification for Britain and Ireland Version 97.06|
|Definition||Rock in the supralittoral is typically characterised by a maritime community of yellow and grey lichens, such as Xanthoria parietina and Caloplaca marina. This band of lichens is usually found immediately above a zone of Verrucaria maura (Ver), a black lichen which is also present in this zone, though typically less than common. Damp pits and crevices are occasionally occupied by littorinid molluscs and acarid mites. In sheltered areas the transition from this biotope to Verrucaria maura (Ver.Ver) is often indistinct and a mixed zone of YG and Ver.Ver may occur. With increasing wave exposure both zones become wider and more distinct. In estuaries this biotope is often restricted to artificial substrata such as sea defences.|
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