Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplants00tube Year: 1897 392 UKEDINEAE. than those of G. tremelloidcs. Tlie aecidiospores—Roestclia cormda—occur on species of Pyrns {Sorhus)] they are much smaller than those of Rorstclia pcnicillata. The Roestclia themselves are long, curved, and horn-like, while the walls of the peridial cells are beset with short processes (Fig. 224). Where Pijrus Aucuparia occurs mixed with Pyrus Malus, it has been observed that Roestcl
Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplants00tube Year: 1897 392 UKEDINEAE. than those of G. tremelloidcs. Tlie aecidiospores—Roestclia cormda—occur on species of Pyrns {Sorhus)] they are much smaller than those of Rorstclia pcnicillata. The Roestclia themselves are long, curved, and horn-like, while the walls of the peridial cells are beset with short processes (Fig. 224). Where Pijrus Aucuparia occurs mixed with Pyrus Malus, it has been observed that Roestclia cornuta is confined . to the former species exclusivily. The Roestclia is the cause of a CP> jv. l''io. 225.—Gyiiinoaporangmm juniperinum and 6. ti-cmcUoides. 1, Young spore- cushions breaking through the bark ; 2, the same in swollen condition ; 3, gela- tinous cushion arranged to show its lower surface ; 4, Juniper-needle with three spore-cushions ; fi, young Juniper plant bearing cushions 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 promycelium with a sporidium attached ; 1.', germinating sporidium. (After Tubeuf.) marked deformation of leaves, petioles, and even (though rarer) fruits of Pyrus Aucuparia and Aronia rotundifolia, both in the lowlands and mountains. I have produced Roestclia cornuta on Pyrits 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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