. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. Fig. 165. Cylindrosporium Pom. (Photographs by Charles Brooks) a, spot induced by inoculation of apple; b, mycelium in agar breaks through it to expose spores and sporophores. The spores are hyaline, from one to five celled, and variously curved and con- torted. They are from 2 to fi in diameter and from 15 to 80/a long. The chlamydospores and stromata are probably the agencies that carry the fungus over the winter. Under ordinary conditions of preparing separation cultures thi
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. Fig. 165. Cylindrosporium Pom. (Photographs by Charles Brooks) a, spot induced by inoculation of apple; b, mycelium in agar breaks through it to expose spores and sporophores. The spores are hyaline, from one to five celled, and variously curved and con- torted. They are from 2 to fi in diameter and from 15 to 80/a long. The chlamydospores and stromata are probably the agencies that carry the fungus over the winter. Under ordinary conditions of preparing separation cultures this fungus does not readily grow, and agar will ordinarily dry out before the fungus becomes notice- able. On this account it has seemed to be a difficult organism to isolate. As a matter of fact, however, under ordinary constantly moist conditions or in liquid media it grows Infection probably takes place in July or August when the stomata are being torn open and the protecting layers of the lenticels are not yet formed, a season when the metabolism of the apple is extremely great and the transpiration stream necessarily large. 1 The " Stippen " disease, long known in Europe and now reported from several parts of the United States, is regarded as entirely distinct, and probably not of fungous 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 Duggar, Benjamin M. (Benjamin Minge), 1872-1956. Boston ; New York : Ginn
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