. Introduction to botany. Botany. CHAPTER XVI FUNGI AND FUNGOUS DISEASES OF PLANTS 220. The fungi as dependent plants. In our earlier discus- sion of plant nutrition it was found that green plants possess chlorophyll, by means of which they make their own foods. Every observant person who has had any considerable experi- ence with plants has noted several or many kinds, as mush- rooms and molds, that do not possess chlorophyll. These chlorophyll-less plants can- not manufacture foods from water and carbon dioxide, and hence are dependent. Their dependence appears in "\'arious relations be
. Introduction to botany. Botany. CHAPTER XVI FUNGI AND FUNGOUS DISEASES OF PLANTS 220. The fungi as dependent plants. In our earlier discus- sion of plant nutrition it was found that green plants possess chlorophyll, by means of which they make their own foods. Every observant person who has had any considerable experi- ence with plants has noted several or many kinds, as mush- rooms and molds, that do not possess chlorophyll. These chlorophyll-less plants can- not manufacture foods from water and carbon dioxide, and hence are dependent. Their dependence appears in "\'arious relations between them and the host plants or animals that supply them the requi- site food. Sometimes they live upon or withm living plants or animals, bemg known as parasites; or they may live upon dead nutrient sub- stances, when they are loiown as saprophytes (fig. 182). There are many common fungous parasites, as wheat rust, potato blight, and tree-destroying fungi. Our economic crops are greatly reduced in value every year through the destruc- tiveness of these parasitic plants. Fungous sapro}ihytes are also very abundant, the best-known being molds, mushrooms, and puffballs. In almost any deeply shaded, moist, and warm 234. Fig. 182. An old pine stump upon which the fungus Polyporus is growing. 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 Bergen, Joseph Y. (Joseph Young), 1851-1917; Caldwell, Otis William, 1869- joint author. Boston, New York, [etc. ] Ginn and company
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