. Elementary botany. Botany. GRO WTH. 119 sion, thus drawing water forcibly through the protoplasmic mem- brane. Since it does not filter out readily, the increase in. tig. log. Spores of mucor, and different stages ot germiDation. quantity of the water in the cell piroduces a pressure from within which stretches the membrane, and the ela,stic cell wall )ields. Thus the gonidium becomes larger. 243. How the gonidia germinate.—"We should find at this time many of tlie gonidia extended on one side into a tube-like process the length of wliich varies according to time and tempera- ture. The
. Elementary botany. Botany. GRO WTH. 119 sion, thus drawing water forcibly through the protoplasmic mem- brane. Since it does not filter out readily, the increase in. tig. log. Spores of mucor, and different stages ot germiDation. quantity of the water in the cell piroduces a pressure from within which stretches the membrane, and the ela,stic cell wall )ields. Thus the gonidium becomes larger. 243. How the gonidia germinate.—"We should find at this time many of tlie gonidia extended on one side into a tube-like process the length of wliich varies according to time and tempera- ture. The short process thus begun continues to elongate. This elongation of the plant is growth, or, more properly speaking, one of the phenomena of growth. 244. The germ tube branches and forms the mycelium.— In the course of a day or so branches from the tube will appear. This branched form of the threads of the fungus is, as we remember, the mvcelium. We can still see the point where growth started from the gonidium. Perhaps by this time se\"eral tubes have grown from a single one. The threads of the m\ ce- lium near the gonidium, that is, the older portions of them, have increased in diameter as they have elongated, though this increase in diameter is by no means so great as the in( rease in length. After increasing to a certain extent in diameter, growth in this direction ceases, while apical growth is practically unlimited, being limited only by the supply of nutriment. 245. Growtb in length takes place only at the end of the thread.—If there were an) Ijranches on the mycelium when 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 Atkinson, George Francis, 1854-1918. New York : H. Holt
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