Archive image from page 120 of The cytoplasm of the plant. The cytoplasm of the plant cell cytoplasmofplant00guil Year: 1941 Chapter X 105 Duality o£ the Ghondriome All these facts lead us to the conclusion that the two categories of cytoplasmic organelles in chlorophyll-containing plants both show the characteristics of chondriosomes and it is evident that there is no criterion, unless it is the ability of the plastids to form starch and chlorophyll, for including the inactive chondriosomes rather than the plastids in the formations known in animal cells as chondriosomes. On the contrary, t
Archive image from page 120 of The cytoplasm of the plant. The cytoplasm of the plant cell cytoplasmofplant00guil Year: 1941 Chapter X 105 Duality o£ the Ghondriome All these facts lead us to the conclusion that the two categories of cytoplasmic organelles in chlorophyll-containing plants both show the characteristics of chondriosomes and it is evident that there is no criterion, unless it is the ability of the plastids to form starch and chlorophyll, for including the inactive chondriosomes rather than the plastids in the formations known in animal cells as chondriosomes. On the contrary, the plastids by their elongated chondriocontal forms sometimes resemble the chondriosomes of animals even more than do the inactive chondriosomes of plants. Fig. 74. — Fern sporangia. Successive stages in the return to a homo- seneous chondriome by resorption of starch and loss of pigment in the chloro- plasts. 1-3, Asplenium Ruta-muraria. 1, sporogenous cells; 2, spore mother cells; 3, tapetum and spore mother cells. 4, Pteridium; tetrad and tapetum. Regaud's method. (After Emberger). The plastids are sometimes, however, slightly larger. Further- more, the inactive chondriosomes unquestionably have the charac- teristics of chondriosomes from which it is impossible to separate them, as Meves does, for they, too, show in a great number of cases the form of typical chondrioconts. These two categories of elements, therefore, fit the definition of chondriosomes. They correspond to organelles seeming to be incapable of forming other than by division, they have the shape
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