elfin saddle

noun2

1. •
   Any of certain ascomycetous fungi of genus Helvella with an irregular cap resembling a saddle, especially Helvella crispa or Helvella lacunosa.

   • Here too are the false morels (genus Gyromitra) and elfin saddles (genus Helvella), which are generally regarded — or suspected — to be poisonous when consumed, especially if eaten raw. — 2003
2. •
   Any member of species Gyromitra infula of ascomycetes, which similarly resemble a saddle.

   • […]since the Bohemian morel can be confused with the toxic elfin saddle (Gyromitra infula) or other undesirable fungi. — 1980