Calicium viride, commonly known as the green stubble lichen, is a species of pin lichen in the family Caliciaceae, and the type species of the genus Calicium. It is a common and widely distributed species in temperate areas of the Northern Hemisphere and southern South America. The thallus of the lichen consists of a basal crust, and apothecia (fruiting bodies) on a stalk. Diagnostic characteristics of Calicium viride are its brown excipulum (the ring of tissue around its apothecia), and its green, granular crust.

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