black moss vs fat choy

black moss

noun
  • Nostoc flagelliforme (fat choy), a terrestrial cyanobacterium eaten in Chinese cuisine. 

  • Any of numerous species of dark-coloured mosses (Bryophyta), possibly species of the genera Grimmia, Andreaea, Syntrichia, Cinclidotus. 

  • Bryoria fremontii (wila), a lichen eaten by First Peoples in North America. 

  • Tillandsia usneoides (Spanish moss), a flowering plant, particularly after it has been dried for use as stuffing and decoration. 

fat choy

noun
  • a blue-green alga (Nostoc flagelliforme) used as a vegetable in Chinese cooking 

How often have the words black moss and fat choy occurred in a corpus of books? (source: Google Ngram Viewer )