. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 392 UREDINKAE. than those of G. tremdloides. The aecidiospores—Boestelia cornuta—occur on species of Pyrus {Sorbiis); they are much smaller than those of Roestelia penicillata. The Hoestelia themselves are long, curved, and hom-like, while the walls of the peridial cells are beset with short processes (Fig. 224). Where Pynts Aucuparia occurs mixed with Pyrus Malus, it has been observed that Boestelia cornuta is conf

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. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 392 UREDINKAE. than those of G. tremdloides. The aecidiospores—Boestelia cornuta—occur on species of Pyrus {Sorbiis); they are much smaller than those of Roestelia penicillata. The Hoestelia themselves are long, curved, and hom-like, while the walls of the peridial cells are beset with short processes (Fig. 224). Where Pynts Aucuparia occurs mixed with Pyrus Malus, it has been observed that Boestelia cornuta is confined to the former species exclusively. The Eoestelia is the cause of a. Fig. 225.—Qy-innoiporaTigiutn. jv.niperinv.m and G. tvanelloides. 1, Young spore- cuflhions breaking through the bark; S, the same in swollen condition ; 5, gela- tinoiis cushion arranged to show its lower surface; 4, Juniper-needle with three spore-cushions ; 5, young Juniper plant bearing cushions on its needles; 6 to id, spores of various lands, to show the variation in size, shape, and thickness of wall; lly ceil of a promycelium with a sporidium attached; IS, 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 Roestelia 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 Roestelia, directly beneath an overhanging juniper with diseased needles.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Tubeuf, Karl, freiherr von, 1862-1941; Smith, William G. London ; New York [etc. ] : Longmans, Green & co.

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