. Fio. 198.— betullna. Teleutospore-sorus, with many of the spores producing promycelia and sporidia (s). /•, Mycelium ; p, parenchyma ; t, portion of ruptured epidermis. (After Tulasiie.) succeeded in re-infecting Betula alba from Caeoma laricis. Eostrup obtained Caeoma mercurialis by infecting Mercurialis with Mel. tremadae; yet this may have happened because two different species of Mclavipsora occurred on the aspen leaves. Klebahn ^ was successful in infesting Pojmlus tremula with Caeoma laricis but did not succeed with the birch. ^ R. Hartig, Allegevi. Forst. u. Jeu/d-zeifung,

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. Fio. 198.— betullna. Teleutospore-sorus, with many of the spores producing promycelia and sporidia (s). /•, Mycelium ; p, parenchyma ; t, portion of ruptured epidermis. (After Tulasiie.) succeeded in re-infecting Betula alba from Caeoma laricis. Eostrup obtained Caeoma mercurialis by infecting Mercurialis with Mel. tremadae; yet this may have happened because two different species of Mclavipsora occurred on the aspen leaves. Klebahn ^ was successful in infesting Pojmlus tremula with Caeoma laricis but did not succeed with the birch. ^ R. Hartig, Allegevi. Forst. u. Jeu/d-zeifung, 1885. "Plowright, " Impfvereuche m. Rostpilzen," Zeitsrhrifi f. Pflanzenkrankheiten, 1891. •'Klebahn, Zd('<chrift f. Pjianzenh-ankhtiteii, 1894.

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectparasit, bookyear1897