RHODOPHYTA (red algae)
Odonthalia dentata
(Linnaeus) Lyngbye, 1819

Lenght: <15 cm
Width: 3-8 mm
 
Thallus flat, deep redish, branched in one plane. Lateral branchlets alternate, short, with serrated top. Midrib evident in the lower part of thallus. Lithophyte. In sublittoral, everywhere, often aboundant. Common. High boreal- Arctic species.