. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. Urediospores absent. Telia amphigenous, partly minute (), and partly large (up to mm), the latter evident in dark brown crusts. Teliospores develop subepidermally, forming an irregular layer; some spores wedge in between the others; small sori, often situated under the stomata, sometimes consist of a few cells, frequently of two hemispherical cells forming a large body resembling the spores of Pucciniastrum; the sori are often built of many spores, flattened by mutual pressure. As shown by Dietel, these bodies
. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. Urediospores absent. Telia amphigenous, partly minute (), and partly large (up to mm), the latter evident in dark brown crusts. Teliospores develop subepidermally, forming an irregular layer; some spores wedge in between the others; small sori, often situated under the stomata, sometimes consist of a few cells, frequently of two hemispherical cells forming a large body resembling the spores of Pucciniastrum; the sori are often built of many spores, flattened by mutual pressure. As shown by Dietel, these bodies (or sori) involve the production of dual (paired) spores borne on a common hypha, while one spore is slightly higher than the other; the dual spores aggregate, sometimes, in heaps of 2 —5 pairs on a common hypha and in this case, examination from above gives the impression of a bicellular or inulticellular spore. The spores in the large, complex, palisade-like heaps are prismatic with rounded ends, 24—50 X 9—14 M, and in the small heaps ellipsoid or globoid, varying in size and shape, 17 — 30 X 1 7 —25 ju ; spore wall yellowish-brown, with a conspicuous apical pore. On Saxifraga granulata, autoecious. General distribution: Europe. On Saxifraga granulata L. — EUROPEAN PART: Bait. (Latvian SSR: environs of Riga; Estonian SSR: near Tallin, Saare 1.). The connection of aecia with the teliospores was experimentally proved by Dietel and Klebahn. Paired teliospores have been reported by Dietel also in Melampsoridium betulae, Melampsora euphorbiae-dulcis, M. larici-tremulae, M. larici-populina, M. reticulatae, and M. epitea, but not in M. euphorbiae or M. (374; FIGURE 148. Melampsora vernalis Niessl. on Saxi- fraga granulata L. Aecio- spores, X 600. (Grig.). 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 origin
Size: 1382px × 1808px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectplants
