. Elementary botany . Fig. 164. 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 the perithecia rupture. If this is done carefully we will see several small ovate sacs issue, each containing a number of spores, as shown in fig. 166. Such a sac is an ascus, and the spores are ascospores.

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Keywords: ., bookcentury1800, bookdecade1890, bookpublisher, booksubjectbotany