While false morels are deadly poisonous when raw, in some parts of the world they are considered edible (and delicious) if properly parboiled. ... Due to its volatility, even the mere presence of fresh false morels in a poorly ventilated space may cause gyromitrin poisoning symptoms such as headache, dizziness and nausea.

What happens if you eat false morels?

Poisonous Effects

Unlike morel mushrooms, false morels are poisonous and eating them can cause illness or even death. False morels contain the toxin gytomitrin that, when ingested, produces monomethylhydrazine (MMH), the leading chemical in rocket fuel, according to the University of Alaska.

Are there poisonous morel lookalikes?

None the less, there are 4 mushrooms that are considered morel look-alikes, and 3 of them are toxic. Verpa Bohemica, Gyromitra, and Verpa conica are all potentially toxic, though easily distinguished from true morels. Half-free morels are not toxic, but they're not particularly tasty. They're also easy to identify.