Clavascidium umbrinum, also known as Catapyrenium umbrinum,[1] is a lichen.

[2] It is characteristically 2 to 4 millimeters wide and medium to dark brown found on soil.

[citation needed] Found in Europe and North America; rather rare in Arizona, California, Chihuahua and Baja California.

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This Eurotiomycetes-related article is a stub.