Shaggy, rigid, dark brownish red tufts, to 200 mm long, from large discoid base. Main axes and branches corticated, often with weft of adventitious laterals. Branches irregularly alternate, those of final order clothed in alternately pinnate ramuli, which are somewhat attenuate at base and apex, with cells 1-1.5 times as long as broad.

Original publication: Gray, S.F. (1821). A natural arrangement of British plants, according to their relations to each other, as pointed out by Jussieu, De Candolle, Brown, &c. including those cultivated for use; with an introduction to botany, in which the terms newly introduced are explained; illustrated by figures. pp. vol. 1: xxviii, 824; vol. 2: viii, 757, XXI plates (vol. 1). London: Baldwin, Cradock & Joy.
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Adjective (Latin), harsh

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.

Basionym
Conferva tetrica Dillwyn

Type information
Type locality: Peninsula of Gower (Dixon & Price 1981: 138). Lectotype: P. Thompson A4502; WELT, Herb. silvanus P.Thompson (Dixon & Price 1981: 138).