beefsteak mushroom vs false morel

beefsteak mushroom

noun
  • Gyromitra esculenta (a potentially fatally poisonous fungus that is a delicacy) 

  • Fistulina hepatica (an edible fungus) 

false morel

noun
  • Any of several Ascomycota mushrooms in the genus Gyromitra which bear a resemblance to the highly regarded true morels of the genus Morchella. 

How often have the words beefsteak mushroom and false morel occurred in a corpus of books? (source: Google Ngram Viewer )