. Senescence and rejuvenescence. Age; Reproduction. 248 SENESCENCE AND REJUVENESCENCE while in Mucor (Fig. 107, A-C) the sporangium arises at the end of a specialized stalk, the sporophore, which grows out of the nutri- tive substratum into the air, and in Penicillium still another type of sporophore appears (Fig. 108). In other forms still other methods of spore formation occur with various degrees of specialization in the spore-forming organs, but everywhere the process consists in a. Figs. 102-105.—Formation of spores in various algae: Figs. 102, 103, Ulothrix; Fig. 104, a stage in the deve
. Senescence and rejuvenescence. Age; Reproduction. 248 SENESCENCE AND REJUVENESCENCE while in Mucor (Fig. 107, A-C) the sporangium arises at the end of a specialized stalk, the sporophore, which grows out of the nutri- tive substratum into the air, and in Penicillium still another type of sporophore appears (Fig. 108). In other forms still other methods of spore formation occur with various degrees of specialization in the spore-forming organs, but everywhere the process consists in a. Figs. 102-105.—Formation of spores in various algae: Figs. 102, 103, Ulothrix; Fig. 104, a stage in the development of the zoospore in Vaucheria; Fig. 105, a filament of Eclocarpus bearing a sporangium and at the left a more highly magnified zoospore. From Coulter, etc., '10. disintegration of the plant body or some part of it into independent cells. According to the conception of individuation presented in the preceding chapter, return to the condition of the free-hving, inde- pendent cell must mean a decrease in the physiological coherence of the plant individual, and it might be expected to result from con- ditions which decrease the metaboHsm of the plant and so allow it, or a part of it, to separate into its constituent units, the cell indi-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Child, Charles Manning, 1869-1954. Chicago, Ill. , The University of Chicago Press
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectreproduction, bookyea
