Clavascidium umbrinum
Scientific classification
Domain:	Eukaryota
Kingdom:	Fungi
Division:	Ascomycota
Class:	Eurotiomycetes
Order:	Verrucariales
Family:	Verrucariaceae
Genus:	Clavascidium
Species:	C. umbrinum
Binomial name
Clavascidium umbrinum (Breuss) Breuss, 1996

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. ^{[citation needed]}