opegraphas

Noun

opegrapha (plural opegraphas)

1. Any lichen species of the genus Opegrapha.
   • But every part is usually covered with thin, membranaceous lichens, (Lecanoras, Lecideas, letter-like Opegraphas) in clouds of every shade of white, gray, and brown, outside, which are often large patches of gray, yellow, and sulphur-colored foliaceous lichens, (Parmelias).1846, A report on the trees and shrubs growing naturally in the forests of Massachusetts, page 159