Description: Grows from a discoid holdfast forming erect fronds to a maximum of 20 cms long. Flattened and dichotomously branching 3 or 4 times in fan-like manner. Very variable.

Habitat: Very common. Epilithic in midlittoral rock pools into the sublittoral to 24 m.

Distribution: Widespread around the British Isles including the Shetlands. Europe: Azores, Portugal, Spain, France, Netherlands, Norway and Iceland. Atlantic coast of North America: Canada and the United States from Maine to Delaware.

Similar Species: Mastocarpus stellatus has a channelled frond and reproduces cystocarps which arise as short papillae.

Key Identification Features:

• Flat frond branching dichotomously.

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

iNaturalist: Chondrus crispus at iNaturalist World Species Observations database.

GBIF data for Chondrus crispus

WoRMS: Chondrus crispus at World Register of Marine Species. Accepted name: Chondrus crispus Stackhouse, 1797. AphiaID: 145625.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Rhodymeniophycidae; Gigartinales; Gigartinaceae; Chondrus