Abstract
Abstract The biochemical and ultrastructural features of Olisthodiscus luteus Carter are compared to those of the five classes of algae which have chloroplasts that are enclosed by chloroplast ER and possess girdle lamellae and a peripheral ring-shaped nucleoid. It is concluded that O. luteus belongs to the Chrysophyceae. Particular attention is paid to the question of whether Olisthodiscus might belong to the Chloromonadophyceae, but several important differences between the chloromonads and O. luteus are noted. For example, the carotenoid pigments of Olisthodiscus are similar to those of the Chrysophyceae and very different from those so far observed in the Chloromonadophyceae. Also Olisthodiscus is not divided into endoplasmic and ectoplasmic regions as all chloromonad cells are, nor does Olisthodiscus possess the characteristic chloromonad rhizostyle. Mitosis in Olisthodiscus is typically Chrysophyceall with an open spindle, whereas in mitotic cells of chloromonads the spindle is closed.
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