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Golden brown velvety growths of the brown algae Pleurocladia lacustris occurring in mats with the red alga Rhodochorton purpureum forming on cave walls and upper littoral levels of cliffs. Fauna is sparse and limited to occasional individuals of the winkle Littorina saxatilis and spirorbid polychaetes. This assemblage is thought to be is widespread throughout Britain, although there are currently few records available. More information are needed to validate this description, which is based on information from the Thanet intertidal survey (Tittley et al. 2004). Received after deadline: A. purpurea has changed name to Rhodochorton purpurea and P. maritima has changed name to Pleurocladia lacustris.