Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplant00tube Year: 1897 392 UREDIXEAE. than those of G. frcmcUoidca. The aecidiospores—lioestdia cormita—occur on species of Pyrus {Sorhus); they are much smaller than those of Rocstelia pr/?-ict7/a<a. The Rocstdia themselves are long, curved, and horn-like, while the walls of the peridial cells are beset with short processes (Fig. 224). Where Pyrus Aucuparia occurs mixed with Pyrua Malvs, it has been observed that Roestc
Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplant00tube Year: 1897 392 UREDIXEAE. than those of G. frcmcUoidca. The aecidiospores—lioestdia cormita—occur on species of Pyrus {Sorhus); they are much smaller than those of Rocstelia pr/?-ict7/a<a. The Rocstdia themselves are long, curved, and horn-like, while the walls of the peridial cells are beset with short processes (Fig. 224). Where Pyrus Aucuparia occurs mixed with Pyrua Malvs, it has been observed that Roestclia cornuta is confined to the former species exclusively. The Rocstdia is the cause of a Fio. 2'2o.— juniperiniim and G. tremclloides. 1, Young spore- cushions breaking through the bark ; ~', the same in swollen condition ; 3, gela- tinous cushion arranged to show its lower surface ; i, Juniper-needle with three spore-cushions ; 5, young Juniper plant bearing cvishions on its needles ; 6 to 10, spores of various kinds, to show the variation in size, shape, and thickness of wall; 11, cell of a promyceliuni with a sporidium attached ; ii', germinating sporidium. (After Tubeuf.) marked deformation of leaves, petioles, and even (though rarer) fruits of Pyrus Aumrparia and Aronia rotundifolia, both in the lowlands and mountains. I have produced Roestclia cornuta on Pyrus Aucuparia by artificial infection with portions of spore-cushions from twigs of juniper, and have observed a mountain ash in closed forest, with abundant Roestclia, directly beneath an overhanging juniper with diseased needles.
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