Abstract
Freshly collected A. riparium (Hedw.) B.S.G. Plants were grown submersed at various temperatures ranging from 6-33.degree. C. Peak growth rates occurred at 23.degree. C and death at 33.degree. C. Response curves for main axis elongation, lateral branch formation, branch elongation and reproductive branch formation differed in shape, and elongation rates changed over time. Lateral branch growth of branches initiated later was lower than growth of branches initiated earlier in the experiment. High temperature stress resulted in a proliferation of branches. Branch and main axis apices appeared to be the most heat resistant parts of the plants.

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