A Note on the Growth of Halosaccion ramentaceum (L.) J. Ag. Under Different Culturing Conditions

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Abstract
H. ramentaceum (L.) J. Ag. (Rhodophyta) plants collected in Iceland were grown in agitated and unagitated media at different temperatures. Reproduction takes place only in agitated media where growth rate was also greatest. Different growth forms were found to arise from the same initial material and were shown to be dependent on the degree of water movement. Optimum growth was achieved in 6 and 9.degree. C cultures which correspond well with summer temperatures in Iceland. Growth was inhibited at 3 and 15.degree. C and a temperature of 20.degree. C was lethal. Such results fit well with the distribution pattern of this species. Plants transplanted into the intertidal of Helgoland grew in spring and early summer when water temperatures were in the same range as in their natural habitats. Plants showed poor growth in July at 15-16.degree. C and perished in Aug. at 18.degree. C.