Uniseriate thallus, erect and with alternate ramifications. The lateral branches are, in turn, branched alternately giving rise to branches of higher order which are also branched. 

Original publication: Nägeli, C. (1862 '1861'). Beiträge zur morphologie und systematik der Ceramiaceae. Sitzungsberichte der Königlichen Bayerischen Akademie der Wissenschaften zu München 1861(2): 297-415, 30 figs, 1 plate.
 Download PDF

Adjective (Latin), resembling the genus Thuja

Maggs, C.A. & Hommersand, M.H. (1993). Seaweeds of the British Isles. Volume 1. Rhodophyta. Part 3A. Ceramiales. pp. xv + 444, 129 figs, map. London: HMSO.

Wynne, M.J. (2005). A check-list of benthic marine algae of the tropical and subtropical western Atlantic: second revision. Beihefte zur Nova Hedwigia 129: 1-152.

Type species
This is the type species (holotype) of the genus Compsothamnion

Basionym
Conferva thuyoides Smith

Type information
Type locality: Undated and unlocalised (Maggs & Hommersand 1993: 164). Lectotype: LINN herb. Smith 1719.36 (Maggs & Hommersand 1993: 164).