. The essentials of botany. Botany. 126 BOTANY. pastry, etc. (Mucor mucedo), is as follows: The vertical hyphse, which are filled with protoplasm, become enlarged at the top, and in each a transverse partition forms {A, a, Fig. 58), the portion above the partition {b) becomes larger, and, at the same time, the transverse partition arches up {B, a), finally appearing like an extension of the hypha, then called the columella {G, a). The protoplasm in the enlarged terminal cell (S) divides into a large number of minute masses, each of which surrounds itself with a cell- A â a. Fig. 58.âDiagrams s
. The essentials of botany. Botany. 126 BOTANY. pastry, etc. (Mucor mucedo), is as follows: The vertical hyphse, which are filled with protoplasm, become enlarged at the top, and in each a transverse partition forms {A, a, Fig. 58), the portion above the partition {b) becomes larger, and, at the same time, the transverse partition arches up {B, a), finally appearing like an extension of the hypha, then called the columella {G, a). The protoplasm in the enlarged terminal cell (S) divides into a large number of minute masses, each of which surrounds itself with a cell- A â a. Fig. 58.âDiagrams shomngmode of growth of the spore-case of Mucor mu- cedo. A, very young stage;^, somewhat later; C, spore-case with ripe spores. a in all the figures represents the partition-wall hetween the last cell of the fila- ment and the spore-case, b. wall; these little cells are the spores, and the large mother- cell is now a spore-case, or sporangium. 266. The spores are set free in difPerent ways: in some cases the wall of the spore-case is entirely absorbed by the time the spores are mature; in other cases only portions of the wall are absorbed, producing fissures of various kinds. The spores germinate readily when on or in a substance capable of nourishing them, by sending out one or two hyphse, which soon branch and give rise to a mycelium. Spores may, if kept dry, retain their vitality for months. 267. Sexual reproduction takes place after the produc- tion of asexual spores. Two hyphse, in the air or within. 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 Bessey, Charles E. (Charles Edwin), 1845-1915. New York : H. Holt and company, ;
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