. Elementary principles of agriculture; a text book for the common schools. Agriculture. Fig. 89. Germinating spores of the potato blight fungus. Cross section through a portion of a stalk. Two germinating spores (a, h) piercing the epidermis, and the threads penetrating the cells of the leaf. 217. How Fungi Propagate. Fungi prop- agate by minute cells, called spores. They cor- respond to seeds of higher plants. They require the same con- ditions for germina- tion as seeds. Fig. 89 shows a spore of the potato blight germinat- ing on a leaf. The first thread soon enters the plant and absorbs th
. Elementary principles of agriculture; a text book for the common schools. Agriculture. Fig. 89. Germinating spores of the potato blight fungus. Cross section through a portion of a stalk. Two germinating spores (a, h) piercing the epidermis, and the threads penetrating the cells of the leaf. 217. How Fungi Propagate. Fungi prop- agate by minute cells, called spores. They cor- respond to seeds of higher plants. They require the same con- ditions for germina- tion as seeds. Fig. 89 shows a spore of the potato blight germinat- ing on a leaf. The first thread soon enters the plant and absorbs the moisture and food substance of the potato leaf. It soon forms a crop of spores, sometimes in only a few days. These spores are blown to other. plants, and soon a whole field will be blighted by the fungus. Most species of fungi grow on only one kind of plant. The fungus that causes grape mildew (Fig. 90) does not grow on any other kind of plants but grapes. The fungus that causes the blasting of the ears and tassels of corn (corn smut) grows only on corn. The fungus that causes the smut of oats never at- tacks corn. However, the Fig. 90. Downy mildew of grape (. i 1 ii {Plasmopora viticola), showing fungus that produces the tuft of gonidiophores bearing , • 1 J. J 1 gonidia, also intercellular myce- rUSt on grains also attacks Uum. After 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 Ferguson, A. M. (Alexander McGowen), 1874-; Lewis, Lowery Laymon, 1869- joint author. Sherman, Tex. , Ferguson Publishing Company
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