. Fungi; their nature, influence, and uses;. Fungi. POLYMOEPHISM. 101 authenticated polymorphy prevails. These fuBgi are developed on the green parts of growing plants, and at first consist of a white mouldy stratum, composed of delicate mycelium, on which erect threads are produced, which break up into subglobose joints or conidia; The species on grass was named Oidium pionilioides before its relationship was known, but undoubtedly this is only the conidia of ErysipTie graminis. In like manner the vine disease (^Oidium Fuckeri) is most probably only the conidia of a species of Erysiphe, of wh
. Fungi; their nature, influence, and uses;. Fungi. POLYMOEPHISM. 101 authenticated polymorphy prevails. These fuBgi are developed on the green parts of growing plants, and at first consist of a white mouldy stratum, composed of delicate mycelium, on which erect threads are produced, which break up into subglobose joints or conidia; The species on grass was named Oidium pionilioides before its relationship was known, but undoubtedly this is only the conidia of ErysipTie graminis. In like manner the vine disease (^Oidium Fuckeri) is most probably only the conidia of a species of Erysiphe, of which the perfect condition has not yet been discovered. On roses the old Oidium leuco- conium is but the conidia of Sphisrotheca pannosa, and so of other species. The JSrysiphe which ultimately appears on the same mycelium consists of globose peritheoia, externally. Fio. 103.—Eryiiphe cichoracearum. w. Receptacle ; o. TOycelium, (De BaryO furnished with thread-like appendages, and internally with asci containing sporidia. In this genus there are no less than five different forms of fruit,* the multiform threads on the mycelium, already alluded to as forms of Oidium, the asci contained in the sporangia, which is the proper fruit of the Erysiphe, larger stylospores which are produced in other sporangia, the smaller stylospores whicK are generated in the pycnidia, and separate sporules which are sometimes formed in the joints of the neck- laces of the conidia. These forms are figured in the " Introduction * Berkeley, " IntroJ. Crypt. ; p. 78, fig. . 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 Cooke, M. C. (Mordecai Cubitt), b. 1825-; Berkeley, M. J. (Miles Joseph), 1803-1889. New York, D. Appleton and Co.
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