Vibrissea truncorum, the water club mushroom or aquatic earth-tongue, is a species of fungus in the family Vibrisseaceae.

Water club mushroom is a fungus that grows up to about 2 centimetres (3⁄4 inch) tall, with a cap 0.3–0.5 cm (1⁄8–1⁄4 in) wide.

It is characterized by its yellow, orange, or reddish fruiting body, and white to bluish-gray stem, darkening to brown at the base.

[3] Vibrissea truncorum is a cosmopolitan mushroom, found throughout the Northern Hemisphere, including North America (in the Pacific Northwest and the Atlantic Northeast),[3] Europe, Japan, and rarely in eastern Russia and Chile.

[4] It is most heavily concentrated in Norway, Sweden, Finland, and Western Russia, though it appears also in the United Kingdom and Southwestern Europe.