Elementary botany (1898) Elementary botany elementarybotany00atki Year: 1898 76 /'// YSIOLOG V. sion, thus drawing water forcibly through the protoplasmic mem- brane. Since it does not filter OUl readily, the increase in Kig. 6s Spoils ol mucor, and different stages oi germination. quantity of the water in the cell produces a pressure from within which Stretches the membrane, and the elastic cell wall yields, dims the gonidium becomes larger. 180. How the gonidia germinate.—We should find at this time many of the gonidia extended on one side into a tube-like process the length of which var
Elementary botany (1898) Elementary botany elementarybotany00atki Year: 1898 76 /'// YSIOLOG V. sion, thus drawing water forcibly through the protoplasmic mem- brane. Since it does not filter OUl readily, the increase in Kig. 6s Spoils ol mucor, and different stages oi germination. quantity of the water in the cell produces a pressure from within which Stretches the membrane, and the elastic cell wall yields, dims the gonidium becomes larger. 180. How the gonidia germinate.—We should find at this time many of the gonidia extended on one side into a tube-like process the length of which varies according to time and tempera- ture. Hie short process thus begun continues to elongate. This elongation of the plant is growth, or, more properly speaking, one of the phenomena of growth. 181. 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 oi the fungus is, as we will remember, the mycelium. We can still see the point where growth started from the gonidium. Perhaps by this time several tubes have grown from a single one. The threads o\ the myce- 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 bv no means so great as the increase in length. After increasing to a certain extent in diameter, growth in this direction ceases, while apical growth is practically unlimited, being limited onlj by the supply oi nutriment. 182 Growth in length takes place only at the end of the thread. — If there were any branches ow the mycelium when the
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