Description: Microscopic or very small. Filaments less than 1mm long irregularly dichotomously branched, of two or more rows of cells.

Habitat: Rare. Sublittoral

Distribution: England: Devon. Europe: Mediterranean, Atlantic coasts of Spain and France. Further afield: Canary Islands, Pacific Ocean from British Columbia to California and Peru.

Similar Species: Stylonema alsidii (Zanardini) K.M. Drew is distinguished having single cell rows.

Distribution Map from NBN: Stylonema cornu-cervi at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Stylonema cornu-cervi at iNaturalist World Species Observations database.

WoRMS: Stylonema cornu-cervi at World Register of Marine Species. Accepted name: Stylonema cornu-cervi Reinsch, 1875. AphiaID: 145689.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Proteorhodophytina; Stylonematophyceae; Stylonematales; Stylonemataceae; Stylonema