Environmental Control of the Life Cycle of Dumontia contorta (Rhodophyta) Kept in Culture

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Abstract
Tetraspores of D. contorta (Gmelin) Ruprecht from the Isle of Man (UK) germinate directly after release into discoid or globular microthalli. Under long-day conditions (16 : .hivin.8) and at higher temperatures (20.degree. C) these microthalli increase in diameter. Under short-day conditions .**GRAPHIC**. and at lower temperatures (8.degree., 12.degree., 16.degree. C) they give rise to macrothalli. This short-day effect is caused by photoperiodism, not by the lower light doses. The macrothallus budding from the microthallus appears to be multiseriate in origin.

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