The microanatomy ofPhaeaster pascheriScherffel (Chrysophyceae)

Abstract
The morphology of this freshwater phytoflagellate (Chrysophyceae or Chrysomonadida) has been studied in detail by electron microscopy. It is unusually complex for a member of its class, having a depressed reniform shape and a second flagellum modified as a photoreceptor, and also possessing rhizopodia, scales and a stellate chloroplast with a central pyrenoid. These structures are compared with similar ones in other members of the class and possible relationships are briefly discussed.