Morchella esculenta is known as the Common Morel, but it is just as difficult or easy to find as any other species, and delicious. Another common name for this morel is the Sponge Mushroom. Gyromitra esculenta is commonly known as the Beefsteak Morel but is poisonous to many people. It is also known as the Brain Mushroom. Some books on fungi use only their scientific names, to avoid the confusion of having several names for one species, or the same name for two different species.
Fungi contain many chemical compounds.
The fungi on sale at the supermarket are species that are not only non-poisonous, but cause no irritating or allergic reaction for most people. The reaction from eating wild mushrooms is less predictable. Classes may also be offered through a local botanical garden or a Continuing Education program. Don't cook mixed collections. Some false morels with smooth or wrinkled caps are poisonous.