leprose vs particularly describing lichens with a granular or powdery thallus

leprose

adj

  • Synonym of leprous, afflicted with leprosy. 

  • Synonym of scaly or lepidote, particularly describing lichens with a granular or powdery thallus. 

particularly describing lichens with a granular or powdery thallus

How often have the words leprose and particularly describing lichens with a granular or powdery thallus occurred in a corpus of books? (source: Google Ngram Viewer )