Studies on Marine Algae of the British Isles: the genusCeramium

Abstract

The British Phycological Society was founded in 1952 to serve as a meetingground for phycologists, and to carry out a co-ordinated scheme of work on the algae of this country. The specific projects included the production of a Flora of British Marine Algae and the publication of a series of biological studies of individual genera and species.

Ceramium nitens (Ceramiaceae, Rhodophyta), an uncommon species from Brazil

“…The number of periaxial cells per node varies from four to 12 in different species of Ceramium (Dixon 1960, Womersley 1978, Lewis & Mei-lan 1996 and has limited value to distinguish species. In C. nitens we have observed up to nine periaxial cells per node, whereas J. Agardh (1879) illustrated 12.…”

“…Around 190 species of Ceramium have been recorded worldwide (Boo & Lee 1994). Within this family, the tribe Ceramieae (Dumortier) Schmitz includes genera with monosiphonous cylindrical or slightly compressed thalli, with cortication at the nodes which can be intermittent or continuous along the thallus such as Ceramium Roth, Corallophila Weber-van Bosse, and Centroceras Kützing (Dixon 1960, Hommersand 1963, Norris 1993, Womersley 1998.…”

Ecotypic differentiation in salinity responses ofCeramium strictum(Rhodophyta) from Scandinavian waters

“…As to the illustration by GOBI (1877: fig. 8) it has been commented (Ro-SENVINGE 1924;DIXON ] 960) that the structures in question are not parasporangia. The culture study discussed here has demonstrated that paraspores are a means of asexual reproduction, as reported earlier by RUENESS (1973).…”

Microcladia exsertasp. nov. (Ceramiaceae, Rhodophyta) from the East coast of South Africa

“…comm. ) as well as in Ceramium (Dixon, 1960). Itono (1977), however, described the formation of periaxial cells in Herpochondria dentata as in opposite pairs (i.e.…”