. Botany; principles and problems. Botany. 298 BOTANY: PRINCIPLES AND PROBLEMS ratus. Whatever its original share in the Hfe cycle may have been, however, it seems now to be entirely functionless. On the lower surface of the barberry leaves are formed cluster-cups or. Fig. 174.—Puccinia graminis, the wheat rust. A, wheat leaf with groups of summer spores (uredospores). B, uredospores (one teleutospore among them). C, germinating uredospore. D, wheat stem with masses of winter spores (tel- eutospores). E, two teleutospores. F, germinating teleutospore, producing a promycelium on which are borne
. Botany; principles and problems. Botany. 298 BOTANY: PRINCIPLES AND PROBLEMS ratus. Whatever its original share in the Hfe cycle may have been, however, it seems now to be entirely functionless. On the lower surface of the barberry leaves are formed cluster-cups or. Fig. 174.—Puccinia graminis, the wheat rust. A, wheat leaf with groups of summer spores (uredospores). B, uredospores (one teleutospore among them). C, germinating uredospore. D, wheat stem with masses of winter spores (tel- eutospores). E, two teleutospores. F, germinating teleutospore, producing a promycelium on which are borne the sporidia. G, sporidium germinating on epidermis of barberry leaf. H, lower surface of barberry leaf, showing cluster- cups or aecidia. /, section through the leaf of barberry showing spermagonium on upper surface and aecidium on lower. The aecidium is producing masses of aecidiospores, which infect wheat plants. {B, C, F and G after De Bary). aecidia (singular, aecidium), flaring, cup-shaped structures from the base of which arise long rows of aecidiospores. These, in. 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 Sinnott, Edmund Ware, 1888-. New York, McGraw-Hill
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1923
