. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 255 the season's growth. These spores, called teliospores, are resting spores and tide the fungus over the winter. Furthermore these spores are uninucleate. The two nuclei which have character- ized all cells from the aecial stage on, actually fuse, forming one nucleus as the teliospores mature. Some regard this as a delayed fertilization. The teliospores germinate in the spring quite. Fig. 163. Fig. 164. Fig. 163. The summer and fall stages of a rust, Puccinia: A, rust blotches on leaf of wheat. B, portion of leaf magnified, sh
. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 255 the season's growth. These spores, called teliospores, are resting spores and tide the fungus over the winter. Furthermore these spores are uninucleate. The two nuclei which have character- ized all cells from the aecial stage on, actually fuse, forming one nucleus as the teliospores mature. Some regard this as a delayed fertilization. The teliospores germinate in the spring quite. Fig. 163. Fig. 164. Fig. 163. The summer and fall stages of a rust, Puccinia: A, rust blotches on leaf of wheat. B, portion of leaf magnified, showing rupturing of the epidermis due to the formation of spores. C, urediniospores or the summer spores which effect a rapid distribution of the parasite during the summer. D, teliospores or fall spores which are dormant during the winter. Fig. 164. Germination of uredinio- and telio-spores: A, the thin-walled urediniospore sending out hyphae from thin places in its wall. This is ef- fected as soon as it is carried by the wind to a moist leaf. B, teliospore ger- minating in the spring and forming a short hypha, from the end of which four cells have been cut off that are forming the basidiospores, b. independent of any plant and being dependent upon the food stored in the spore, they only form short hyphae which usually become divided into four cells (Fig. 164, B). This structure is known as the basidium. Each cell of the basidium sends out a delicate tube into the end of which the cell contents passes, thus. 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 Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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