Abstract
The growth and development of plants of Sargassum muticum (Yendo) Fensholt is described both from culture and from plants growing in the sea at Friday Harbor, San Juan Island, Washington, U.S.A. The early development of the germlings and the relationship between various parameters of their growth are described from culture. The rate of development is related to water temperature and is very rapid at 25°C. Detached branches were also cultured and they grew at the same rate in culture as in the sea: the rate of growth was inversely proportional to the degree of fertility, vegetative branches growing up to five times faster than fertile ones. The study of plants growing in the sea indicates a very rapid growth rate in the spring falling markedly as the plants become fertile in July and August. Shortly afterwards the fertile portions of the plant are shed and drift away. These fragments are still fertile when they detach and probably constitute an efficient mode of dispersal.
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