. Plant studies; an elementary botany. Botany. 270 PLANT STUDIES While the ordinary method of reproduction through the growing season is by means of these rapidly germinating spores, in certain conditions a sexual process is observed, by which a heavy-walled sexual spore is formed as a resting spore, able to outlive unfavorable conditions. Branches arise from the hyphae of the mycelium just as in the forma-. FlG. 236. Mature sporangium of Mucor, showing the wall (A), the numerous spores (C), and the columella (B)—that is, the partition wall pushed up into the cavity of the sporangium. —Moore.
. Plant studies; an elementary botany. Botany. 270 PLANT STUDIES While the ordinary method of reproduction through the growing season is by means of these rapidly germinating spores, in certain conditions a sexual process is observed, by which a heavy-walled sexual spore is formed as a resting spore, able to outlive unfavorable conditions. Branches arise from the hyphae of the mycelium just as in the forma-. FlG. 236. Mature sporangium of Mucor, showing the wall (A), the numerous spores (C), and the columella (B)—that is, the partition wall pushed up into the cavity of the sporangium. —Moore. Fig. 237. Bursted sporangium of Mucor, the ruptured wall not being shown, and the loose spores adhering to the colu- mella.—Moore. tion of sporophores (Fig. 238). Two contiguous branches come in contact by their tips (Fig. 238, A), the tips are cut off from the main coenocytic body by partition walls (Fig. 238, B), the walls in contact disorganize, the contents of the two tip cells fuse, and a heavy-walled sexual spore is the result (Fig. 238, 0). It is evident that the process is conjugation, suggesting the Conjugate forms among the. 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 Coulter, John Merle, 1851-1928. New York, D. Appleton and Company
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