Abstract
The anterior flagellum of the phytoflagellate Vacuolaria virescens (Class Chloromonadophyceae) bears flagellar hairs. Each hair has two components: a tapered base which is superficially attached to the flagellar membrane and a 170 A diameter microtubular shaft that arises from the distal end of the hair base and usually forms an angle with it. Parts of the endoplasmic reticulum in this organism are greatly dilated and contain large numbers of closely packed microtubules which are aligned approximately parallel to each other. These intracisternal microtubules have an outside diameter of 170 A and are composed of 8 subunits; they appear to be identical to the shaft portions of the flagellar hairs in diameter, intensity of staining, preservation after fixation in osmic acid, and resistance to colchicine treatment. A vesicle containing flagellar hairs and opening at its distal end into the flagellar groove has been observed. This is thought to be an intermediate stage between the intracisternal microtubules and the final position of flagellar hairs on the flagellar membrane.
Published Version
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