Abstract

THE pyrenoids are colourless masses of protein associated with the chromatophores in several classes of the Protophyta. They have been most studied in the Isokontae (Boubier, Bull. Herb. Boissier, 7, p. 451; 1899; Bourquin, Bot. Gaz., 64, 426; 1917), where they are embedded in the substance of the chloroplast and are covered with an envelope consisting of small starch grains which are the last to disappear under starvation conditions. The pyrenoids are generally regarded as reserve protein stores. During the formation of reproductive cells they disappear more or less completely.

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