. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. Opsi-Uredinales repeating aecia may develop on the myceliuna formed by aeciospores, whereupon the secondary aecia, as stated earlier, are not preceded by spermagonia. More often than not infection with aeciospores does not give rise to a new generation of FIGURE 3. Spermagonia and aecia of Puccinia graminis Arthur applied the term aecium to all sporophores arising from gametophytic (haploid) mycelia developing from basidiospores, irrespective of the morphology of the sporophore; thus he designated even the prima
. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. Opsi-Uredinales repeating aecia may develop on the myceliuna formed by aeciospores, whereupon the secondary aecia, as stated earlier, are not preceded by spermagonia. More often than not infection with aeciospores does not give rise to a new generation of FIGURE 3. Spermagonia and aecia of Puccinia graminis Arthur applied the term aecium to all sporophores arising from gametophytic (haploid) mycelia developing from basidiospores, irrespective of the morphology of the sporophore; thus he designated even the primary urediain Brachy-Uredinales "stylosporous" or "uredinoid" aecia. In the true or cup-shaped aecia the rows of spores are surrounded initially on the sides and on top by a cover, the peridium or pseudoperidium. The peridial roof develops from the first apical cells of the first spore- forming rows, the lateral walls being built of modified cells of the external rows, homologous with the spores in the inner rows. Embedded in the form of spherical bodies in the plant tissue, the aecia subsequently emerge, their peridium tearing at the apex and allowing the aeciospores to scatter. In the species of Puccinia, Uronayces, and other genera (Ochropsora) the peridium usually ruptures at the indented margin which is fre- 43 quently more or less flexed to the outside. In Trsuizschelia and Leucoteliiim the peridium ruptures into several lobes (3 — 5). The 48. 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 Botanicheskii institut im. V. L. Komarova. Jerusalem [Published for the National Science Foundation, Washington, D. C. by the Israel Program for Scientific Translations
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectplants
