Porphyra purpureaPorphyra purpurea is a species of red algae in the order Bangiales.DescriptionThis red alga consists of a single membranous layer of cells forming a blade attached by a disk holdfast. It grows to a length of 20 to 50 cm long. The blade has the texture of a thin polythene sheet.HabitatThey are littoral, growing on rock, pebbles, limpets and barnacles.DistributionRecorded from Canada and Europe. Common in Great Britain, Ireland and Isle of Man.