. Introduction to botany. Botany. Algas, Fungi, and Lichens. 281 bushes where these abound, producing chains of spores, termed aecidiospores, in cup-shaped cases (Fig. 144, B). These spores become discharged, and when blown to the surface of a leaf of wheat they grow into it, and finally summer spores appear at the surface of the leaf, as already described. It appears, then, that the rust of wheat produces three kinds of spores and requires two kinds of plants to run the full course of its existence. The winter spores, however, can establish themselves in the leaves of wheat without the interv
. Introduction to botany. Botany. Algas, Fungi, and Lichens. 281 bushes where these abound, producing chains of spores, termed aecidiospores, in cup-shaped cases (Fig. 144, B). These spores become discharged, and when blown to the surface of a leaf of wheat they grow into it, and finally summer spores appear at the surface of the leaf, as already described. It appears, then, that the rust of wheat produces three kinds of spores and requires two kinds of plants to run the full course of its existence. The winter spores, however, can establish themselves in the leaves of wheat without the intervention of the bar- berry, and the summer spores can also sur- vive the winter and reproduce the fungus on wheat the following spring. Other parasitic Fungi of common occur- rence which often do great damage to the plants of the field and garden are the smuts and mildews. Fig. 143. Germinating te- leutospore of wheat rust. After Fig. 144. A, leai of barberry bearing aecidiospores of wheat rust. B, cross section tlirough the barberry leaf, showing groups of spores immersed in the tissue of the leat {B after De Bary.) 174. Toad- stools. — The toadstools are too commonly observed to re- quire descrip- tion here, and only a brief ac- count of their structure and ways of life will be necessary. The stem and. 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 Stevens, William Chase, 1861-. Boston, D. C. Heath & Co.
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