Diseases of plants induced by Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith diseasesofplants00tubeuoft Year: 1897 392 UREDIXEAE. than those of G. tramiloides. The aecidiospores—Boestelia cormcta—occur on species of Pyrus (Sorbus); they are much smaller than those of Boestelia pciiicillata. The Boestelia themselves are long, curved, and horn-like, while the walls of the peridial cells are beset with short processes (Fig. 224). Where Pi/rns AuciqMria occurs mixed with Pyrus M
Diseases of plants induced by Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith diseasesofplants00tubeuoft Year: 1897 392 UREDIXEAE. than those of G. tramiloides. The aecidiospores—Boestelia cormcta—occur on species of Pyrus (Sorbus); they are much smaller than those of Boestelia pciiicillata. The Boestelia themselves are long, curved, and horn-like, while the walls of the peridial cells are beset with short processes (Fig. 224). Where Pi/rns AuciqMria occurs mixed with Pyrus Malus, it has been observed that Boestelia cornuta is confined to the former species exclusively. The Boestelia is the cause of a Pig. 225.—Gymtwsporangium juniperinum and G. trcmelloides. 1, Young spore- cushions breaking through the bark ; 2, the same in swollen condition ; 3, gela- tinoiis cushion arranged to show its lower surface ; U, Juniper-needle with three spore-cushions ; 5, young Juniper plant bearing cushions on its needles ; G to 10, spores of various kinds, to show the variation in size, shape, and thickness of wall; 11, cell of a prumycelium -with a sporidium attached ; 13, germinating sporidium. (After Tubeuf.) marked deformation of leaves, petioles, and even (though rarer) fruits of Pyrus Aucujiaria and Aronia rotundifolia, both in the lowlands and mountains. I have produced Boestelia cornuta on Pyrus Aucujjariet by artificial infection with portions of spore-cushions from twigs of juniper, and have observed a mountain ash in closed forest, with abundant Boestelia, directly beneath an overhanging juniper with diseased needles.
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