Description: Thallus cylindrical erect to 50 cms long. Completely corticate but young branches may appear banded.

Habitat: Epiphytic and on artifical materials. Usually sublittoral to 11 m.

Distribution: Apparently widespread in the British Isles, probably under-recorded.

Similar Species: Other Ceramium species which are not spiny and are corticate.

Distribution Map from NBN: Ceramium secundatum at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Ceramium secundatum at iNaturalist World Species Observations database.

WoRMS: Ceramium secundatum at World Register of Marine Species. Accepted name: Acrochaetium secundatum (Lyngbye) Nägeli, 1858. AphiaID: 144387.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Rhodymeniophycidae; Ceramiales; Ceramiaceae; Ceramioideae; Ceramieae; Ceramium