The Structure and Development of the Reproductive Organs and Carposporophyte in two British Species of Gelidium

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Abstract
The structure and development of the reproductive organs and carposporophyte are described for two British species of Gelidium, G. latifolium (Grev.) Born. & Thur. and G. pulchellum (Turn.) Kütz. The gonimoblast does not develop directly from the unchanged carpogonium, as was thought by Kylin, but a swollen multinucleate cell of irregular outline is formed first, either from the carpogonium alone, or by the fusion of the carpogonium and certain neighbouring cells; the gonimoblast develops from long, non-septate processes of this multi-nucleate cell. The significance of the fusion of the carpogonium and certain vegetative cells is discussed in relation to the various definitions of the auxiliary cell which have been proposed. It is concluded that an auxiliary cell does not occur in Gelidium.

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