Description: One or more stipes grow from a discoid holdfast expanding into a flattened frond with parallel side, these devide dichotomously several times to a maximum of 10 cms long.

Habitat: Epilithic in lower littoral rock pools and sublittoral to 13 m.

Distribution: Generally a south western species in the British Isles: southern Ireland, southern England, Wales and western isles of Scotland. Europe: Mediterranean, Azores, Portugal, Spain and France. Atlantic coast of North America: Labrador to Connecticut. Also recorded from the Canary Islands.

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

iNaturalist: Gymnogongrus crenulatus at iNaturalist World Species Observations database.

WoRMS: Gymnogongrus crenulatus at World Register of Marine Species. Accepted name: Gymnogongrus crenulatus (Turner) J.Agardh, 1851. AphiaID: 145656.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Rhodymeniophycidae; Gigartinales; Phyllophoraceae; Gymnogongrus