Description: Plants of very small uniseriate filaments with prostrate and erect axes which grow to 6 mm long.

Habitat: Mainly epiphytic but also grows on stones and shells in the sublittoral to 15 m.

Distribution: Generally on the north-eastern shores of the British Isles but recorded from the south-west of England and Wales and the south of Ireland. Europe: Baltic Sea, Denmark, Norway, Faroes and Sweden. Greenland. Atlantic coast of North America: Canada. Further afield: Arctic Sea including Spitzbergen and Novaya Zemlaya.

Similar Species: All species of Acrochaetiaceae are similar, microscopic examination required for identification.

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

iNaturalist: Grania efflorescens at iNaturalist World Species Observations database.

WoRMS: Grania efflorescens at World Register of Marine Species. Accepted name: Grania efflorescens (J.Agardh) Kylin, 1944. AphiaID: 495087.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Nemaliophycidae; Acrochaetiales; Acrochaetiaceae; Grania