Amanita muscaria vs fly agaric

Amanita muscaria

fly agaric

noun
  • A poisonous and hallucinogenic mushroom, Amanita muscaria, with a large crimson cap, fading to yellow, scattered with white flecks. 

How often have the words Amanita muscaria and fly agaric occurred in a corpus of books? (source: Google Ngram Viewer )