Dudresnaya verticillata (Withering) Le Jolis
Picture above © Bernard Picton, Ulster Museum
Description: Gelatinous, bushy, crimson fronds, to 250 mm long. Central
axis polysiphonous, much branched, clothed with close-set whorls of short,
repeatedly dichotomously branched monosiphonous ramui, 3-4 mm wide.
Habitat: On rocks, low intertidal (very rarely) and subtidal, often on maërl. Widely distributed; a rare, sporadic summer annual.
Similar species: Schmizia hiscockiana.
Picture immediately above © M.D. Guiry