False morels are difficult to treat in an article on edible and poisonous mushrooms because they so clearly fit both categories.
On one hand, many people have enjoyed eating false morels for years and may even consider them a favorite wild mushroom. On the other, false morels have definitely caused serious illnesses and deaths in the United States.
The problem seems to involve the amount of a toxic chemical, called monomethyl hydrazine (MMH), present in these mushrooms. MMH causes diarrhea, vomiting and severe headaches, and occasionally it can be fatal. However, because of different cooking techniques and different individual sensitivities to MMH, false morels poison some people but leave others unaffected. In addition, false morels in some areas of the country contain more MMH than in other areas. All this makes these mushrooms a very doubtful group as far as edibility is concerned.
False morels have wrinkled, irregular caps that are brain-like or saddle-shaped. They may be black, gray, white, brown or reddish. (The "big red morel," Gyromitra caroliniana, common in Missouri, is a large false morel with a reddish cap.) Other names include elephant ears, Arkansas morels and brain mushrooms. Size: 2 to 8 inches tall.