Description: Crusts of irregularly branched prostrate filaments with erect filaments no more tham 8 cells long.

Habitat: Very small. Marine on mud, woodwork, rock or stone. Upper littoral and in salt marshes.

Distribution: Widely distributed in the British Isles. Europe: Portugal, Spain, France, Netherlands, the Baltic, Norway and Iceland. Greenland. Atlantic coast of North America: Canada, Maine, New Hampshire, Massachusetts, Rhode Island, Connecticut, Long Island, Virginia, Florida and Bermuda.

Similar Species: Requires microscopic examination for identification.

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

iNaturalist: Pseudendoclonium submarinum at iNaturalist World Species Observations database.

WoRMS: Pseudendoclonium submarinum at World Register of Marine Species. Accepted name: Pseudendoclonium submarinum Wille, 1901. AphiaID: 144879.

Classification: Biota; Plantae; Viridiplantae; Chlorophyta; Chlorophytina; Ulvophyceae; Ulvales; Kornmanniaceae; Pseudendoclonium