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You need to be careful if you know where to pick them, as they can be confused with a poisonous mushroom known as Gyromitra esculenta, or brain fungus, though it's not too difficult to distinguish between them, and I should point out that in Eastern Europe the Gyromitra esculenta is eaten after repeated boiling and discarding of the cooking water.
One mushroom traditionally gathered and eaten in Europe is now thought to present an unpredictable but real risk of potentially fatal hydrazine poisoning; this is the gyromitre or false morel species of Gyromitra.
Page 220, lines 6 and 9, for _Gyromytra_ read Gyromitra.
The genus _Gyromitra_ is very closely related to _Helvella_, and is only distinguished by the fact that the cap is marked by prominent folds and convolutions, resembling somewhat the convolutions of the brain.
Changed Gyromytra to Gyromitra in accordance with the corrections list.
_Helvella esculenta_ Persoon (Gyromitra esculenta), particularly in old or decaying specimens.