Opegrapha venosa

Plate 2454 from English Botany; or, Coloured Figures of British Plants, with their essential characters, synonyms, and places of growth: to which will be added, occasional remarks. Text by James Edward Smith and illustrations by James Sowerby. Published in London between late 1790 and early 1814 in numerous instalments, grouped into 36 volumes. In today's taxonomy this painting would represent a species in the genus Enterographa.