Archive image from page 125 of The cytoplasm of the plant. The cytoplasm of the plant cell cytoplasmofplant00guil Year: 1941 N Guilliermond - Atkinson 110 Cytoplasm ..-».. ill P'V-v ill merit (Fig. 78, B, C) and then there can be followed in these cells (Fig. 78, D-F) a differentiation of large rhodoplasts from some of the elements of the chondriome. In the mature carpospores (Fig. 78, G, H) there are found fairly large, well differentiated, disc-shaped rhodoplasts. In the Characeae, Mangenot found small chloroplasts and chondriosomes in the apical cells but in the oosphere there is no ch
Archive image from page 125 of The cytoplasm of the plant. The cytoplasm of the plant cell cytoplasmofplant00guil Year: 1941 N Guilliermond - Atkinson 110 Cytoplasm ..-».. ill P'V-v ill merit (Fig. 78, B, C) and then there can be followed in these cells (Fig. 78, D-F) a differentiation of large rhodoplasts from some of the elements of the chondriome. In the mature carpospores (Fig. 78, G, H) there are found fairly large, well differentiated, disc-shaped rhodoplasts. In the Characeae, Mangenot found small chloroplasts and chondriosomes in the apical cells but in the oosphere there is no chlorophyll. In the cells which give rise to the oosphere, Mange- not observed a regression of the small chloroplasts. They lose their chlorophyll and are transformed into mitochondria or short rods which can not be distinguished in the young oospheres from the inactive chondriosomes. In the course of development of the oosphere, some of the mitochondria and rods representing the former chloroplasts, elongate and take on the shape of typical chondrioconts, whereas the inactive chondriosomes persist in the form of mitochondria. The chondrioconts then elaborate numerous starch grains in the usual way. They cor- respond therefore to amyloplasts. Information on the development of the plastids is still scarce in the bryophytes. It has already been seen that Rudolph, Scherrer, Sape- HiN, and MOTTIER believed that chlorophyll persists in these plants in all stages of development. They state that bryophytic cells always contain chloroplasts and chondrio- somes at the same time. The fact is well demonstrated for Anthoceros but is questioned for the other bryo- phytes. Whereas P. A. Dangeard, P. Dangeard, Gavaudan and Weier tend to confirm it, Alvarado, Sen- JANINOVA, MOTTE and Chalaud op- pose it and believe that the chloroplasts are derived from the chondriosomes. Alvarado has stated that in young paraphyses of Mnium cuspidatum there are no chloroplasts but only chondrio- somes of which
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