Ultrastructural Localization of Acid Phosphatase in Starved Tokophrya infusionum*

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Abstract
SYNOPSIS. Young organisms of Tokophrya infusionum starved for several hr, are best suited for a study of the fine structure of this organism including the distribution of its organelles. Acid phosphatase was localized by a combined electron microscopy and cytochemical approach using modified Gomori methods. The enzyme was found in small dense bodies, spheroid vesicles, missile‐like bodies, rough‐surfaced endoplasmic reticulum, residue and autophagic vacuoles. The small dense bodies are thought to be primary lysosomes since electron micrographs show a) a continuity between the membrane of the rough‐surfaced endoplasmic reticulum and that of the dense bodies and b) a connection between the contents of both structures when the dense bodies form from the endoplasmic reticulum.