The separate and combined effects of calcium, pH, light, IAA, Gibberrellic acid and Kinetin on spore germination and protenema development in the copiously fruiting moss, Stereophyllum radiculosum (Hook) Mitt. have been studied. Calcium and the growth substances, at the appropriate concentrations, promoted spore germination and protonema development but inhibited the processes when lacking or in excess. Calcium, though required in minute quantities, is essential for bud formation and gametophore production. Effect of light was found not to be phototropic only but also stimulatory for some formative substances required in spore germination and development of protonemata. pH 5-6 was optimal for these processes in the moss, Stereophyllum.
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