Abstract
Cultures of the complanate form of Scytosiphon lomentaria (Lyngbye) J. Agardh were initiated at different times of year, maintained in several temperature daylength regimes, and grown through at least three generations. The composition of the F 1 generation varied on a seasonal basis, with a greater proportion of complanate individuals in winter and a predominance of ralfsioid and and cylindrical individuals in spring-summer. In culture, complanate thalli were only initiated from zooids derived from thalli (complanate or ralfsioid) grown in short days; ralfsioid progeny developed in long days. Some kinds of ralfsioid thalli and the cylindrical thalli developed and reproduced in long and short day conditions. The effects of temperatures between 11° and 20°C were subtle, and principally related to the rate of growth of cultured plants and not to the determination of particular stages in the life history. The relationship between the seasonal occurrence of complanate S. lomentaria, its seasonal pattern of reproduction, and the effects of daylength on the life history are discussed.
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