Abstract
Abstract Different types of vacuoles have been observed in a fresh-water alga: Oscillatoria sp. Among these, the ones showing a limiting membrane have been considered in more detail and their mechanism of formation studied. These membrane-bound vacuoles appear to be related to enlargements of the thylakoids. Thylakoid enlargement can occur in different ways: 1) The thylakoid itself becomes uniformly and regularly enlarged to form the true vacuoles. 2) Enlargements appear only in precisely localized areas of the thylakoid. These areas appear to be terminal points which increase in size to form vacuoles star-shaped in section. 3) The thylakoids enlarge irregularly to form the keritoms.
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