SUMMARY The morphology and ontogeny of Thorea riekei sp. nov. from a spring‐fed stream in Landa Park, New Braunfels, Texas, are described. The organism was isolated into unialgal culture and grown through its complete life history, stages of which are illustrated by photomicrographs. Comparative studies were made of herbarium specimens of Thorea species from several United States herbaria. A review of the taxonomic literature on the genus Thorea revealed a considerable number of inaccurate and doubtful determinations of herbarium specimens. A brief study of the ultrastructure of T. riekei is included.
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Harry W. Bischoff (1965) studied this question.
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