Dieses Lehrbuch behandelt grundlegende Konzepte der Botanik, einschließlich Pflanzenstruktur, Physiologie und Reproduktion. Sie erforscht verschiedene Pflanzenarten und ihre Rolle in Ökosystemen mit Illustrationen, die das Lernen erleichtern.
1994 x 1253 px | 33,8 x 21,2 cm | 13,3 x 8,4 inches | 150dpi
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. The essentials of botany. Botany. 164 BOTANY. velvety appearance, which is due to the fact that its sur- face is covered with myriads of short, jointed, vertical fila- ments, each of which bears one or more conidia (Fig. 89, 1). The conidia, which fall off readily, are produced until the latter part of summer, when the filaments which bear them shrivel up and disappear. 342. During the latter part of summer spore-sacs are produced, but require the greater part of winter to come to perfection. The spore-sacs grow in the cavities of mi-. Fia. 89.—Structure of Black Knot. 1, filaments bearing conidia; 2, stylo- spores; 3, _ahollow papilla Cperithecium) containing spore-sacs; 4, spore-sacs and spores, with tliree slender filaments (paraphyses); 5, a spore; 6, spores germi- nating. AU much magnified. nnte papillae (perithecia), and are intermingled with slender filaments (paraphyses, 3 and 4, Fig. 89). Each spore-sac contains eight spores, which eventually escape through a pore in the top of the sac. These spores germinate by sending out a small filament, or sometimes two (Fig. 89, 6). 343. Besides the perithecia, there are other cavities found which much resemble them and contain other sup- posed reproductive bodies. 344. No sexual organs have as yet been observed.. 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.. Bessey, Charles E. (Charles Edwin), 1845-1915. New York : H. Holt and company, ;
