Some fungi produce their sexual spores in long, sausage-shaped sacs called asci. These fungus are called ascomycetes and are placed in the phylum Ascomycota. There are usually eight spores to an ascus. This is achieved by the ascus generating four sex cells by the normal process of meiosis, and then each of those four cells splitting. There are some asci, though, that produce many more spores than that (thousands, in a few cases), and I'm not sure how that works. Also, in some cases (see the next picture) the spores themselves are septate, containing more than one cell; in that case, I believe that all the cells in one spore are clones of one another.
In the larger Discomycetes such as the morels and cup fungi, not only does a single ascus expel all its spores at once, but generally all (or most) of the asci on a fruiting body dehisce at the same time, creating a smoky cloud of spores hanging in the air over the mushroom. A sudden, slight change in light, moisture, or air pressure often sets them off - - blowing a slight puff of air on the fruiting body often does the trick.