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Apical segments of Cystoseira barbata f. aurantia were grown in the laboratory under various light conditions: white light (as reference) or broad band isoquantic red light (600-700 nm, peak transmission: 660 nm) or blue light (400-580 nm, peak transmission: 430 nm). Growth of apices was higher under blue light than in other conditions. Morphogenesis of cultivated thalli under white or red light was different from field plants with high growth of primary axis and low level of ramifications. Under blue light, morphogenesis of thalli was similar to those harvested in nature. Net photosynthesis was measured and P VS I curves were established under white light. Maximum net photosynthetic rates and initial slope were higher for thalli cultivated under blue light and lower under white and red light (...)