Lemanea is a stiff bristle-like branched or unbranched alga similar to a coarse horsehair.

Close inspection show it to have small swellings at more or less regular intervals along its length.

[1] World-wide nine species are listed in algaebase:- [1] The genus name of Lemanea is in honour of Dominique Sébastien Léman (1781-1829), who was an Italian-French botanist (interested in Pteridology, Algology and Mycology) and also Mineralogy.

[2] The genus was circumscribed by Jean Baptiste Bory de St. Vincent in Ann.

A Lemanea species was found on slabs in the rapidly flowing streams in the NW of the Island of Mull.