guttate vs macular

guttate

adj
  • Spotted. 

  • Shaped like, or resembling drops. 

verb
  • To exude drops of xylem sap on the edges of leaves. 

macular

adj
  • Having macules; spotted 

  • Relating to the macula, the area of the retina responsible for detailed central vision 

How often have the words guttate and macular occurred in a corpus of books? (source: Google Ngram Viewer )