. Botany for high schools and colleges. Botany. Fig. 158.âDiagram showing the mode of growth of Mucor Mucedo. m, the mycelium; s, single sporangium, borne on an aerial erect hypha.âAfter Prantl. liyplia), wliicli produce few or many separable reproductive cellsâthe spores (Fig. 158). The method of formation of the spores in Miocor Mucedo is as follows : the vertical hy- phfe, which are filled with protoplasm, become enlarged at i5"^ M the top, and in each a transverse partition forms {A, a, Fig. 159), the portion above the partition (h, Fig. 159) becomes larger, and, at the same time, the
. Botany for high schools and colleges. Botany. Fig. 158.âDiagram showing the mode of growth of Mucor Mucedo. m, the mycelium; s, single sporangium, borne on an aerial erect hypha.âAfter Prantl. liyplia), wliicli produce few or many separable reproductive cellsâthe spores (Fig. 158). The method of formation of the spores in Miocor Mucedo is as follows : the vertical hy- phfe, which are filled with protoplasm, become enlarged at i5"^ M the top, and in each a transverse partition forms {A, a, Fig. 159), the portion above the partition (h, Fig. 159) becomes larger, and, at the same time, the transverse partition arches up {B, a, Fig. 159), finally aj)pearing like an extension of the hypha, then called the Columella (C, a, Fig. 159). The pro- toplasm in the en- larged terminal cell (b) divides into a large number of minute masses, each of which surrounds itself with a cell- wall ; these little cells are the spores, and the large mother- cell is now a sporangium. In the other Moulds the process is essentially like that in 3fucor Mucedo. In j^ -q many cases there are sev- jf^ eral sporangia formed at the top of the vertical hyphse; in such cases the latter are branched before the formation of sporan- gia. Another variation from the method as de- scribed above is that in some species but one spore is formed in each sporan- gium ; the hyphae then appear to bear naked spores. 317.âThe spores are set free in different ways ; in some cases the wall of the sporangium is entirely absorbed by the time the spores are mature ; in other cases only portions of â h. Pig. 159.âDiagi'ams showing mode of growth of the sporangium of Mucor Mucedo. A, very young stage; B. somewhat later ; C. sporangium with ripe spores, a in all the fig- ures repi'esents the partition wall between the last cell of the filament and the sporangium Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearanc
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