Cell differentiation in tetrasporophytes of Callithamnion roseum Harvey (Rhodophyceae, Ceramiales)

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Abstract
Tetrasporophytes of Callithamnion roseum Harvey were cultured in a synthetic sea water medium. Their developmental morphology was found to be identical with the morphology of regenerates of the same species. A change in cell type, from parallel cross-walled to oblique cross-walled cells occurs during differentiation of the tetrasporophytes. Apices of differentiating tetrasporophytes extend along sigmoid curves. Branches develop from oblique cross-walled cells of the tetrasporophytes.

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