Description: Thallus small, appearing as small spots, filaments no more than 1 cm long. Growing epiphytically on the fronds of Laminaria, the filaments densely entangled and matted.

Habitat: Epiphytic on Laminaria and other low littoral and sublittoral algae.

Distribution: Widespread around the British Isles including the Shetlands. Europe: Spain, France, Netherlands, Helgoland, Baltic Sea, Norway, Faroes and Iceland. Greenland. Atlantic coast of North America: Canada, Maine, New Hampshire and Massachusetts. Further afield: British Columbia.

Similar Species: Microscopic examination required for determination.

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

iNaturalist: Laminariocolax tomentosoides at iNaturalist World Species Observations database.

WoRMS: Laminariocolax tomentosoides at World Register of Marine Species. Accepted name: Laminariocolax tomentosoides (Farlow) Kylin, 1947. AphiaID: 145446.

Classification: Biota; Chromista; Harosa; Heterokonta; Ochrophyta; Phaeophyceae; Fucophycidae; Ectocarpales; Chordariaceae; Laminariocolax