Calicium hyperellum

Descrission:

Description: English: A drawing of the lichen formerly known as Calicium hyperellum (now Calicium viride), from a scan of a plate from Smith & Sowerby’s English Botany, Vol. X (1843). Smith & Sowerby note the following: “The bright yellow-green thallus forms conspicuous patches on the bark of old oaks and some other trees, chiefly in the eastern and southern counties of England. Pilidia abundant, on slender black stalks: disc convex, nearly hemispherical: border smooth, eventually reflexed.”. Date: 1808. Source: http://fungi.myspecies.info/all-fungi/calicium-hyperelloides. Author: James Sowerby (1757-1822).