. Fig. 210.—Chrysomyxo, rhododendri on Rho- dodfiidron ferrugineum. Uredospore-sori in September as elongated white stripes on the stem below the leaves, (v. Tubeuf del.) The uredospores are yellow and ovoid, with granular protuber- ances on their coats; they are developed in series from the sori.^ The disease may be further propagated during the same year Ijy the uredospores. In districts where spruce does not occur, it is probable that these spores hibernate, and in the following spring produce germ-tubes which infect other alpine-rose leaves. It frequently happens that whole forests of spru
. Fig. 210.—Chrysomyxo, rhododendri on Rho- dodfiidron ferrugineum. Uredospore-sori in September as elongated white stripes on the stem below the leaves, (v. Tubeuf del.) The uredospores are yellow and ovoid, with granular protuber- ances on their coats; they are developed in series from the sori.^ The disease may be further propagated during the same year Ijy the uredospores. In districts where spruce does not occur, it is probable that these spores hibernate, and in the following spring produce germ-tubes which infect other alpine-rose leaves. It frequently happens that whole forests of spruce are so attacked by this fungus that many of the trees retain only a few healthy needles. Diseased needles die and fall in the summer of attack, so that the trees may be almost wholly stripped, and thei'eby suffer considerable damage. Chr. ledi (Alb. et Scliwein.)^ ( America). This fungus 1 Raciborski regards the Uredo as a Caeoma-iorm. - De Bary, Bofaii. Zeittnir/, 1879.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectparasit, bookyear1897
