. Botany all the year round; a practical text-book for schools. Botany. 284 FUNGI rust is known to be capable of propagating year after year in the uredo stage alone.^ the spores surviving through the winter on volunteer grains and other grasses. 406. Cedar Apples.—An excellent subject for study is the common fungus {Gymnosporangiunt) that produces upon red cedar twigs the large excrescences familiarly known as " cedar ; It is related to the wheat rusts, but has only two phases, its spores germinating and pro-. 543. — Two species of " cedar apple " (Gymnosporangium')
. Botany all the year round; a practical text-book for schools. Botany. 284 FUNGI rust is known to be capable of propagating year after year in the uredo stage alone.^ the spores surviving through the winter on volunteer grains and other grasses. 406. Cedar Apples.—An excellent subject for study is the common fungus {Gymnosporangiunt) that produces upon red cedar twigs the large excrescences familiarly known as " cedar ; It is related to the wheat rusts, but has only two phases, its spores germinating and pro-. 543. — Two species of " cedar apple " (Gymnosporangium'), showing stage of the apple rust fungus corresponding to the uredo-teleuto stages of wheat rust (from Coulter's "Plant Structures"). ducing aecidia upon the leaves of apple, hawthorn, and other kindred plants. In this stage it is known as Rostelia, and is the cause of apple rust and other similar orchard diseases. Specimens are generally easy to obtain and can be studied by the same methods outlined in the foregoing paragraphs. 407. Polymorphism. — Plants that pass through different stages in their life history are said to be polymorphic, that ^ Bulletin 16, United States Department of 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 Andrews, Eliza Frances, b. 1840. New York, Cincinnati [etc. ] American book company
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