Abstract
A more detailed study of ‘peculiar’ Golgi structure in this organism has been attempted than in any similar species, using modem fixation methods. Where comparisons are possible there is close resemblance to the related genus Prymnesium, to a degree sufficient to suggest that this particular type of Golgi system is likely to be a major phyletic indicator for the class Hapto-phyceae. Certain stages of scale production have been traced and some developmental aspects of the whole system are discussed, though full interpretation is deferred. Some additional features of haptonema structure are described for the sake of completeness in characterizing the particular strain of the species under investigation. These include information on the internal structure of the haptonema tip.

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