Description: Thallus erect with terete stipe and blades to 10 cms long and 0.8 cms wide. Midrib conspicuous from which latteral, mainly monostromatic, blades grow irregularly with rounded tips.

Habitat: Epilithic and epiphytic in rock pools in the low littoral and sublittoral to 17 m.

Distribution: Generally distributed around the British Isles including the Shetlands and Channel Islands. Europe: Mediterranean, Portugal, Atlantic coasts of Spain and France, Baltic Sea, Norway. Further afield: Canary Islands, South Atlantic and Indian Ocean.

Similar Species: Hypoglossum woodwardii distinguished from the former by the rounded tips of the blades in Apoglossum; in Membranoptera the blades are asymmetric.

Key Identification Features:

• Small blades with midrib and rounded frond tips. Lateral blades arise from the midrib.

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

iNaturalist: Apoglossum ruscifolium at iNaturalist World Species Observations database.

WoRMS: Apoglossum ruscifolium at World Register of Marine Species. Accepted name: Apoglossum ruscifolium (Turner) J.Agardh, 1898. AphiaID: 144737.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Rhodymeniophycidae; Ceramiales; Delesseriaceae; Sarcomenioideae; Apoglosseae; Apoglossum