One of the most famous sac fungi is the Morel mushroom shown at the right. Morels are famous because they are so good to eat! Common in many parts of North America, they grow in rich soil and though there are several species (this one is Morchella angusticeps), they are all delicious.
There are some "false morels," which are not so good for eating. However, any mushroom with a honeycombed cap like the one at the right, in which the depressions are very deep, is a morel. The depressions in false morels are shallow or nonexistent. Spore-producing sacs, or asci, are borne in palisadelike layers lining the cap's depressions.