Peziza arvernensis, commonly known as the boring brown cup fungus or fairy tub,[1] 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 10abbr=onNaNabbr=on 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.[2] Peziza vesiculosa and P. violacea are similar, young specimens of the latter having a violet hue.
. Michael Jordan (mycologist) . The Encyclopedia of Fungi of Britain and Europe . . 2004 . 45 . 978-0-7112-2379-0.