Meeresalgen von Helgoland: Ergänzung

Abstract

Complementary to a previous publication (Kornmann & Sahling, 1977), this investigation deals mainly with microscopic algae occurring in the rocky littoral of Helgoland island (North Sea). Based on the results obtained from cultivation experiments, the heterogeneous Ulvella-complex of Dangeard has been rearranged and partly included in a new genus Stromatella, and Planophila respectively. The life history of Chlorocystis cohnii proved to be heteromorphic, the zygotes developing into a Codiolum-sporophyte. Also in Halochlorococcum marinum, some of the biflagellate swarmers give rise to Codiolum-like cells. Chlorocystis and Halochlorococcum, up to now members of the Chlorococcales, are incorporated into the new Codiolophycean order, Chlorocystidales. Three new Halochlorococcum species are described, the epiphytic "Chlorochytrium" moorei also being combined with this genus. Supplementary observations on some crustose red algae from transparent substrates are included in this study, as well as findings of some species not previously reported for the Helgoland area. © 1983 Biologische Anstalt Helgoland.