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Exposed lower eulittoral rock or moderately exposed lower eulittoral vertical rock that supports a dense turf of the red seaweed Corallina officinalis, often on wave surged rocky slopes. There is usually a low abundance of other turf-forming red seaweeds such as Lomentaria articulata, Mastocarpus stellatus, Palmaria palmata and Osmundea pinnatifida. Other seaweeds that occur in low abundance includes the wrack Himanthalia elongata and the kelp Laminaria digitata, while the brown seaweed Leathesia marina can be found growing on and around the other seaweeds. Green seaweeds such as Ulva intestinalis, Ulva lactuca and Cladophora rupestris are also present. The coralline turf creates a micro-habitat for small animals such as the colonial tube building polychaete Spirobranchus sp. and the barnacle Semibalanus balanoides. The mussel Mytilus edulis is often found in small cracks and crevices while the sponges Halichondria panicea and Hymeniacidon perlevis can be found in shaded areas or on overhangs. The limpets Patella ulyssiponensis and Patella vulgata can be found on the bedrock underneath the turf. The brown seaweed Bifurcaria bifurcata and the barnacle Perforatus perforatus may occur in the extreme south-west.

Very exposed to moderately exposed lower eulittoral rock that supports a dense turf of the red seaweed Corallina officinalis, often on wave surged rocky slopes. There is usually a low abundance of other turf-forming red seaweeds including Lomentaria articulata, Mastocarpus stellatus, Palmaria palmata and Osmundea pinnatifida. Other seaweeds that occur in low abundance includes the wrack Himanthalia elongata, Laminaria digitata while the brown seaweed Leathesia marina can be found growing on and around the other seaweeds. The green seaweeds Ulva intestinalis, Ulva lactuca and Cladophora rupestris are present as well. A number of invertebrates are present on the bedrock underneath the coralline turf, including the barnacle Semibalanus balanoides, the mussel Mytilus edulis, the sponges Halichondria panicea and Hymeniacidon perlevis, the anemone Actinia equina and the limpets Patella ulyssiponensis and Patella vulgata. The brown seaweed Bifurcaria bifurcata and the barnacle Perforatus perforatus may occur in the extreme south-west. Two variants have been described: C. officinalis and kelp (Coff.Coff) and C. officinalis, H. elongata and the limpet P. ulyssiponensis (Coff.Puly).

Very exposed to exposed lower eulittoral bedrock shores in the south-west can support a dense turf of the red seaweed Corallina officinalis found underneath the long erect fronds of the wrack Himanthalia elongata. The rock surface is pitted with the limpet Patella ulyssiponensis. Also found on the bedrock is the barnacle Chthamalus stellatus or the limpet Patella vulgata, while numerous cracks and crevices provide shelter for anemones such as Actinia equina or the mussel Mytilus edulis. Other turf-forming red seaweeds include Lomentaria articulata, Mastocarpus stellatus, Palmaria palmata, Gastroclonium ovatum, Ceramium spp. and Osmundea pinnatifida which can be found along with the kelp Laminaria digitata. Foliose green seaweeds such as Ulva intestinalis and Ulva lactuca may also be present along with siphonous Codium spp. Sponges such as Grantia compressa, Halichondria panicea and Hymeniacidon perlevis may be present in shaded areas. The brown seaweed Bifurcaria bifurcata and the barnacle Perforatus perforatus may occur in the extreme south-west.