The morphology and reproduction of Thorea okadai (Rhodophyta)

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Abstract
Detailed morphological studies have been carried out on the vegetative thallus, gametangia and carposporophytes of Thorea okadai Yamada collected from southern Japan. The carpogonium is borne laterally or terminally on a cell of an assimilatory filament. The gonimoblast initials are produced directly from the fertilized carpogonium, dividing soon afterwards to form several filaments. The gonimoblast filaments produce branches which penetrate among both the assimilatory filaments and the medullary filaments, resulting in the formation of a diffuse carposporophyte. On the basis of these and other data, Thorea is maintained in the Thoreaceae and referred to the order Batrachospermales.

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