Bangia fuscopurpurea (Dillwyn) Lyngbye
Description: Gelatinous, unbranched, blackish-purple filaments, at first uniseriate later multiseriate, attached by rhizoidal outgrowths from basal and adjacent cells. Cells with central star-shaped rhodoplast with pyrenoid.
Habitat: On rock, wood, etc., as fleecy mat, especially at high tide level on exposed coasts in autumn and winter, disappearing in spring or early summer, at other times present as sparse filaments in shade at all levels and subtidally. Widely distributed, seasonally abundant.
Photographs © M.D. Guiry