. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 220 FUNGOUS DISEASES OF PLANTS these layers into all available space, smaller hyphae are protruded; thus a compact inclosing body or perithecium is developed. With the further growth of the perithecium and the increase in size of the ascus, the inner layer and all internal hyphal branches are dissolved and appropriated. Meanwhile, the outer layer be- comes yellow or brown and forms the true wall of the peri- thecium. From the wall cells of the perithecium there are. Fig. 86. Spore
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 220 FUNGOUS DISEASES OF PLANTS these layers into all available space, smaller hyphae are protruded; thus a compact inclosing body or perithecium is developed. With the further growth of the perithecium and the increase in size of the ascus, the inner layer and all internal hyphal branches are dissolved and appropriated. Meanwhile, the outer layer be- comes yellow or brown and forms the true wall of the peri- thecium. From the wall cells of the perithecium there are. Fig. 86. Spore Forms and Appendages of Erysiphace^e a, Erysiphe Polygoni; &, Podosphcera Oxyacanthce ; c, Microsphara Alni; e, Phyllactinia Corylea ; d and /, Uncinula necator produced, either from the base or from a more or less equatorial plane, the characteristic appendages. In a few cases only are appendages produced from the apex. At maturity there are one or more asci, depending upon the genus, and each ascus con- tains normally from two to eight spores, the shape-of the ascus varying from practically spherical in the one-ascus forms to clavate or cylindrical where there are two or many asci. The spores are one celled and colorless. As a rule the ascospores do not germinate immediately, requiring a period of rest. By. 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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Keywords: ., bookauthorduggarbe, bookcentury1900, bookdecade1900, bookyear1909
