. Elementary botany. Botany. Fig, 165. Willow mildew; bit of mycelium with erect conidiophores, bearing cbain of gonidia; gonidium at left germinating. Fruit of willow mildew, showing hooked ap- pendages. Genus uncinula. Figs. 166, 167.—Perithecia (perithecium) of two powdery mildews, showing escape of asci containing the spores from the crushed fruit bodies. Fig. 167. Fruit body of an- other mildew with dichotomous appen- dages. Genus microsphsra. many of the powdery mildews have a variable number of spores in an ascus, a large majority of the ascomycetes have just 8 spores in an ascus, while
. Elementary botany. Botany. Fig, 165. Willow mildew; bit of mycelium with erect conidiophores, bearing cbain of gonidia; gonidium at left germinating. Fruit of willow mildew, showing hooked ap- pendages. Genus uncinula. Figs. 166, 167.—Perithecia (perithecium) of two powdery mildews, showing escape of asci containing the spores from the crushed fruit bodies. Fig. 167. Fruit body of an- other mildew with dichotomous appen- dages. Genus microsphsra. many of the powdery mildews have a variable number of spores in an ascus, a large majority of the ascomycetes have just 8 spores in an ascus, while Fig. Contact of an- theridium and carpo gonium (carpogonium the larger cell); the beginning of Fig. 169. Disappear- ance of contact walls of anthe- ridium and i''o> J/O- Fertilized egg surrounded by the enveloping threads which grow np around it. Figs. 168-170.—Fertilization in sphaerotheca; one of the powdery mildews. (After Harper.) some have 4, others 16, and .some an indefinite number. The complex struc- ture of the fruit body, as well as the usually definite and limited number of carpogonium, and fusion of the two 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 Atkinson, George Francis, 1854-1918. New York, H. Holt
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