Description: Thallus of erect blades to 30 cms long, much branched with a short stipe, blades to 0.8 cm wide with midrib and acute apices.

Habitat: Common. Epilithic or epiphytic on large algae and corallines, in lower littoral and sublittoral to 30 m.

Distribution: Generally around the British Isles including the Shetlands and the Channel Isles. Europe: Mediterranean, Azores, Portugal, Atlantic coasts of Spain and France, the Netherlands. Atlantic coast of America: from North Carolina to Brazil. Further afield: Canary Islands.

Similar Species: Membranoptera alata and Apoglossum ruscifolium, however neither have the acute apices to the blades to be seen in Hypoglossum.

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

iNaturalist: Hypoglossum hypoglossoides at iNaturalist World Species Observations database.

GBIF data for Hypoglossum heterocystideum

WoRMS: Hypoglossum hypoglossoides at World Register of Marine Species. Accepted name: Hypoglossum heterocystideum (J.Agardh) J.Agardh, 1898. AphiaID: 371595.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Rhodymeniophycidae; Ceramiales; Delesseriaceae; Delesserioideae; Hypoglosseae; Hypoglossum