Elementary botany . , and the minute bodies within them spermatia, since they wereonce supposed to be the male element of the fungus. Their function is notknown. They appear in the spots at an earlier time than the cluster cups. 406. How the cluster-cup stage was found to be a part of the wheat rust.—The cluster-cup stage of the wheat rust was once supposed also to be a dif-ferent plant, and the genus was called cecidium. The occurrence of wheatrust in great abundance on the leeward side of affected barberry bushes inEngland suggested to the farmers that wheat rust was caused by barberryrust.
Elementary botany . , and the minute bodies within them spermatia, since they wereonce supposed to be the male element of the fungus. Their function is notknown. They appear in the spots at an earlier time than the cluster cups. 406. How the cluster-cup stage was found to be a part of the wheat rust.—The cluster-cup stage of the wheat rust was once supposed also to be a dif-ferent plant, and the genus was called cecidium. The occurrence of wheatrust in great abundance on the leeward side of affected barberry bushes inEngland suggested to the farmers that wheat rust was caused by barberryrust. It was later found that the secidiospores of the barberry, when sownon wheat, germinate and the thread of mycelium enters the tissues of thewheat, forming mycelium between the cells. This mycelium then bearsthe uredospores, and later the teleutospores. FUNGI: RUSTS, 19] 407. Uredospores can produce successive crops of uredospores.—The uredo-spores are carried by the wind to other wheat or grass plants, germinate. Fig. through leaf of barberry at point affected with the cluster-cup stage of the whealrust; spermagonia above, ascidia below. (After Marshall-Ward.) form mycelium in the tissues, and later the pustules with a second crop oiuredospores. Several successive crops of uredospores may be developed in
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Keywords: ., bookauthoratk, bookcentury1900, bookdecade1900, booksubjectbotany
