Peziza arvernensis

Peziza arvernensis, commonly known as the boring brown cup fungus or fairy tub, is a species of apothecial fungus belonging to the family Pezizaceae. This fungus appears as brown cups, often in small groups, on soil in broad-leaved woodland, especially with beech. The ascocarps can grow quite large, up to 10 cm across. This species is widespread in Europe with a few records from North and South America.

The exterior of the fruit bodies is pale tan, while the interior is brown. Peziza vesiculosa and P. violacea are similar, young specimens of the latter having a violet hue.