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The acidosome-like vesicle (ac) has at least 2 enclosing
membranes or one membrane indented back on itself and an internal
electron-opaque tongue-like droplet (arrowhead) that is
continuous with the enclosing membranes at one end of the vesicle and
may arise by invagination of these membranes into the vesicle’s
interior. Such vesicles do not resemble lysosomes of any other
organism, including Paramecium. Lysosome membranes should be
thicker and be coated by a heavy glycocalyx and exhibit latency. There
is no glycocalyx seen here. rer, rough endoplasmic reticulum.
EM taken on 8/15/67 by R. Allen with Philips 200 TEM. Neg. 19,200X.
Bar = 0.5µm.
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