. Botany for high schools. Botany. 256 GENERAL MORPHOLOGY OF PLANTS zation and germinate.* This ripening and functioning of eggs without fertilization is known to occur in some animals, notably the plant lice, and in some of the flowering plants. 413. Stoppage of drain pipes by water molds.—Some of the water molds (notably Leptomitus ladeus) grow in waste pipes and drains from refrigerators, cider presses, etc., and cause annoy- ance by stopping the flow of the waste water. Flushing with water often clears the drain, but if the fungus continues to be troublesome its growth can be prevented by
. Botany for high schools. Botany. 256 GENERAL MORPHOLOGY OF PLANTS zation and germinate.* This ripening and functioning of eggs without fertilization is known to occur in some animals, notably the plant lice, and in some of the flowering plants. 413. Stoppage of drain pipes by water molds.—Some of the water molds (notably Leptomitus ladeus) grow in waste pipes and drains from refrigerators, cider presses, etc., and cause annoy- ance by stopping the flow of the waste water. Flushing with water often clears the drain, but if the fungus continues to be troublesome its growth can be prevented by flushing the drain now and then with a weak solution of blue vitriol. The Downy Mildews and White Rust. 414. The downy mil- dews.—The downy mildews received this name from the numerous sporophores, often branched, which are crowded in spots on the parts of plants which they attack. These crowded sporophores look like so much down, and the affected areas have also a mildewed appearance. They are true parasites, since showing tuit of gonidiophores bearing gonidia, also .1 i t • i ^ j intercellular mycilium. (After Millardet.) they attack livmg plants and often cause serious diseases of cultivated plants, entailing thousands of dollars of loss to the horticulturist or farmer. Some of the important diseases caused by them are downy mildew of the grape and cucumber, onion. Fig. 215. Downy mildew of grape (Plasmopora viticola), * This germination of eggs which have not been fertilized is sometimes called 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 Atkinson, George Francis, 1854-1918. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
