Chaetomorpha linum is a species composed of fine hair-like, uniseriate, unbranched filaments. Cells 1 - 2 times as long as broad, maximumwidth 585μm. Cells cylindrical or barrel-shaped. Both unattached and attached forms exist. The unattached plants form masses of twisted filaments the attached filament grow as tufts from a definite base.
Habitat
In Ireland found in fresh water. Both attached and unattached forms are to be found in marine waters.