. The elements of botany embracing organography, histology, vegetable physiology, systematic botany and economic botany ... together with a complete glossary of botanical terms. Botany. 144 SYSTEMATIC BOTANY. Pig. 260), or many-celled (as in Phragmidium). They rupture the epidermis and become exposed, but generally remain attached to their host-plant during the winter. In the spring, they germinate by sending out from each cell a jointed filament, called the promycelium. In small branches of the promycelium, small terminal cells, or sporidia, are formed. These are carried about by the wind, an

. The elements of botany embracing organography, histology, vegetable physiology, systematic botany and economic botany ... together with a complete glossary of botanical terms. Botany. 144 SYSTEMATIC BOTANY. Pig. 260), or many-celled (as in Phragmidium). They rupture the epidermis and become exposed, but generally remain attached to their host-plant during the winter. In the spring, they germinate by sending out from each cell a jointed filament, called the promycelium. In small branches of the promycelium, small terminal cells, or sporidia, are formed. These are carried about by the wind, an Stock Photo
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Central Historic Books / Alamy Stock Photo

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. The elements of botany embracing organography, histology, vegetable physiology, systematic botany and economic botany ... together with a complete glossary of botanical terms. Botany. 144 SYSTEMATIC BOTANY. Pig. 260), or many-celled (as in Phragmidium). They rupture the epidermis and become exposed, but generally remain attached to their host-plant during the winter. In the spring, they germinate by sending out from each cell a jointed filament, called the promycelium. In small branches of the promycelium, small terminal cells, or sporidia, are formed. These are carried about by the wind, and germinate on the proper host- plant. They send their filaments into the parenchyma of the leaf, from which a mycelium proceeds that gives rise to an secidium, and so on, as before described. In some species all the stages may grow on the same plant; more often the seci- ^™ dial stage is found on one plant, and the other stages on some other one ; or, in yet other species, each stage may have a different host- plant. The Wheat Rust belongs to the second group; its seeidial stage occurs only on the Barberry leaves, and the uredo-spores and teleutospores are found on Wheat and other Graminem.. Fig. 260. Cedar-Apple, Gymnosporangium (or Podisoma") macroptis, on yuni- perw Virginiana; tel^ teleutospores, highly magnified.. 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.. Kellerman, William Ashbrook, 1850-1908. Philadelphia, J. E. Potter and Company

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