Elementary botany . Fig. 225. Leaves of willow showing willow mildew. The black dots are the fruit bodies (perithecia) seated on the white mycelium. press on the cover glass with a needle until we see a few of theperithecia rupture. If this is done carefully we see severalsmall ovate sacs issue, each containing a number of spores, asshown in fig. 227. Such a sac is an ascus, and the spores areascospores. FUNGI: SAC FUNGI. 197 415. Number of spores in an ascus.—The ascus is the most importantcharacter showing the general relationship of the members of the sac Fig. mildew;bit
Elementary botany . Fig. 225. Leaves of willow showing willow mildew. The black dots are the fruit bodies (perithecia) seated on the white mycelium. press on the cover glass with a needle until we see a few of theperithecia rupture. If this is done carefully we see severalsmall ovate sacs issue, each containing a number of spores, asshown in fig. 227. Such a sac is an ascus, and the spores areascospores. FUNGI: SAC FUNGI. 197 415. Number of spores in an ascus.—The ascus is the most importantcharacter showing the general relationship of the members of the sac Fig. mildew;bit of myceliumwith erect conidio-phores, bearingchain of gonidia;gonidium at leftgerminating. Fig. 227. Fruit of willow mildew, showing hooked appendages. Genus uncinula. Figs. 227 228.—Perithecia (perithe-cium) of two powdery mildews, showingescape of asci containing the spores fromthe crushed fruit bodies. Fig. body of an-other mildew withdichotomous ap-pendages. Genusmicrosphaera. While many of the powdery mildews have a variable number of spores in
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Keywords: ., bookauthoratk, bookcentury1900, bookdecade1900, booksubjectbotany
