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Description: |
Brownish-red fronds, to 50 mm long. Unseriate filaments, coticated below, repeatedly branched with simple, alternate branches, ultimate branchlets densely clothed with tufts of alternate ramuli, corymbose, incurved, attenuate at base and apex. Articulations of main axes 2-4 times as long as broad, of ramuli 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: [i]-xxviii, [1]- 824, pls I-XXI plates. London: Printed for Baldwin, Cradock & Joy, Paternoster-Row.
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| Name History |
Adjective (Latin), four-angled (Stearn 1973). |
| References |
Rueness, J. & Rueness, M. (1985). Regular and irregular sequences in the life history of Callithamnion tetragonum (Rhodophyta, Ceramiales). British Phycological Journal 20: 329-333. |
| Habitat: |
Epiphytic, lower intertidal and subtidal, widely distributed, frequent. |
| Type information: |
Basionym: Conferva tetragona Withering Type locality: Bill of Portland, Dorset, England (Dixon & Price 1981: 138). Lectotype: Velley & Stackhouse; undated; GL (Maggs & Hommersand 1993: 129). |
