. Beginners' botany. Botany. Fir,. 132. —A Parasitic FUNGUS, magnified. The mycelium, or vegetative part, is shown by the dotted- shaded parts ramify- ing in the leaf tissue. The rounded haus- toria projecting into the cells are also shown. The long fruiting parts of the fungus hang from the under surface of the leaf. taches itself to another plant, the dod- der dies away at the base and becomes wholly dependent. It produces flowers in clusters and seeds itself freely (Fig. 133). Parasites and Saprophytes. — A plant that is dependent on a living plant or animal is a parasite, and the plant or
. Beginners' botany. Botany. Fir,. 132. —A Parasitic FUNGUS, magnified. The mycelium, or vegetative part, is shown by the dotted- shaded parts ramify- ing in the leaf tissue. The rounded haus- toria projecting into the cells are also shown. The long fruiting parts of the fungus hang from the under surface of the leaf. taches itself to another plant, the dod- der dies away at the base and becomes wholly dependent. It produces flowers in clusters and seeds itself freely (Fig. 133). Parasites and Saprophytes. — A plant that is dependent on a living plant or animal is a parasite, and the plant or animal on which it lives is the host. The dodder is a true parasite; so are the rusts, mildews, and other fungi that attack leaves and shoots and injure them. The threads of a parasitic fungus usually creep through the intercellular spaces in the leaf or stem and send suckers (or haustoria) into the cells (Fig. 132). The threads (or the hy- phae) clog the air-spaces of the leaf and often plug the stomates, and they also appropriate and disorganize the cell fluids ; thus they injure or kill their host. The mass of hyphae of a fungus is called mycelium, Some of the hyphae finally grow out of the leaf and produce spores or reproductive cells that an- swer the purpose of seeds in distrib- uting the plant (&, Fig. 132). A plant that lives on dead or de- caying matter is a saprophyte. Mush- rooms (Fig. 131) are examples; they live on the decaying matter in the dotderin soil. Mold on bread and cheese is an 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 Bailey, L. H. (Liberty Hyde), 1858-1954. New York, The Macmillan company
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