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Lower littoral fringe bedrock or stable boulders and mixed substrata in sheltered to extremely sheltered conditions characterised by a dense cover of the wrack Pelvetia canaliculata. The biotope may be present in localised sheltered patches on moderately exposed shores. P. canaliculata overgrows a crust of black lichens Verrucaria maura or the non-calcified red algae Hildenbrandia rubra on very sheltered shores. Individuals of the wrack Fucus spiralis can usually be found among the P. canaliculata and/or in lower part of the biotope. This biotope lacks the density of barnacles found amongst the P. canaliculata on more exposed shores. The winkle Littorina saxatilis occurs, as do a variety of amphipods. The red alga Catenella caespitosa can be present especially in more shaded areas while the green seaweed Ulva spp. can be present in moist areas.