XVI International Botanical Congess

The ultrastructure of Phacus trypanon was studied with TEM. The flagellar apparatus features peculiar components. Three microtubular roots are associated with the basal bodies, a four-membered ventral root, three-membered intermediate root and five-membered dorsal root. The rare short and small striated fibers are positioned between the microtubular roots and basal bodies. These fibers have not been described in the Euglenales but in Eutreptia pertyi of the Eutreptiales. It is also characteristic in Euglenophyceae that the striated fiber in the putative vestigial cytopharynx region originate from the membrane of the reservoir/canal transition region and is associated with the semi-circular microtubules. The striated fiber characters will be discussed with those of other euglenoids and kinetoplastida.