File:A text-book of mycology and plant pathology (1917) (14765039922).jpg

Identifier: textbookofmycol00hars (find matches)
Title: A text-book of mycology and plant pathology
Year: 1917 (1910s)
Authors: Harshberger, John W. (John William), 1869-1929
Subjects: Plant diseases Fungi
Publisher: Philadelphia : P. Blakiston's Son & Co.
Contributing Library: University of British Columbia Library
Digitizing Sponsor: University of British Columbia Library

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Stat., Univ. Wise, July, 1915.) minutely pitted and almost spheric with thick walls and granular con-tents. The first a^cia (Figs. 81 and 82) become mature during themonth of July and viable spores are produced in large numbers duringthis and the following two months (Fig. 83). This is the period ofinfection of the red cedar, and the mycelium formed from these sporesremains dormant in the cedar leaves until the following spring, whenthe cedar apple (Fig. 76), or gall, is formed out of the parenchymaof the red cedar leaf (Fig. 161). Into the gall a vascular strand extends.The surface of the galls becomes papillate and in May these papilheenlarge into gelatinous horns, or teliosori (Fig. 77), made up of theagglutinated stalks of numerous teliospores (Fig. 77), which are two-celled and measure 46 to 63/x by 15 to 20/i (Fig. 78). These telio- RUST FUNGI 213 spores on germination produce a four-celled basidium (Fig. 78),or promycelium, from which are cut off basidiospores, which infect the
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partially developed apple leaves, or apple fruits (Fig. 79). The dis-ease apparently does little damage to the red cedar trees, but the 214 MYCOLOGY aecial stage devastates the apple orchards found in proximity to redcedar trees infected with the rust. Destroying the red cedar treesseems to be the only feasible plan of combating the disease. BIBLIOGRAPHY OF THE RUSTS Arthur, J. C: Cultures of Uredineae. I (1899), Botanical Gazette, 29: 268-276;II (1900 and 1901), Journal of Mycology, 8: 51-56; IV (1Q03), Journal of My-cology, 10: 8-21; V (1904), Journal of Mycology, 11: 50-67; VI (1905), Journalof Mycology, 12: 11-27; VII (1906), Journal of Mycology, 13: 189-205; VIII(1907), Journal of Mycology, 14: 7-26; IX (1908), Mycologia, i: 225-256; X(1909), Mycologia, 2: 213-240; XI (1910), Mycologia, 4: 7-33; XII (1911),Mycologia, 4: 49-65; XIII (1912, 1913 and 1914), Mycologia, 7: 61-89;XIV (1915), Mycologia, 8: 125-141. Arthur, J. C. and Holway, E. W. D.: Description of American Uredineae. B

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