Description: A crust up to 1 mm thick and 5 cms across. Dark brown becoming black when dry.

Habitat: Very rare. Epiphytic on stones and the stipes of Laminaria, low littoral and sublittoral to 19 m.

Distribution: Very poorly recorded but may be generally distributed around the British Isles. Europe: Denmark, the Baltic and Norway.

Similar Species: The tetrasporic phase of Mastocarpus stellatus is distinguishable only microscopically.

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

iNaturalist: Haemescharia hennedyi at iNaturalist World Species Observations database.

WoRMS: Haemescharia hennedyi at World Register of Marine Species. Accepted name: Haemescharia hennedyi (Harvey) K.L.Vinogradova & Yacovleva, 1989. AphiaID: 145627.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Rhodymeniophycidae; Gigartinales; Haemeschariaceae; Haemescharia