Porphyra purpurea is a species of red algae in the order Bangiales.

This red alga consists of a single membranous layer of cells forming a blade attached by a disk holdfast.

[1][2] The blade has the texture of a thin polythene sheet.

[3] They are littoral, growing on rock, pebbles, limpets and barnacles.

[5] Common in Great Britain, Ireland and Isle of Man.