White champignon long-rooted (Leucoagaricus barssii) photo and description

Long-root white champignon (Leucoagaricus barssii)

  • Department: Basidiomycota (Basidiomycetes)
  • Subdivision: Agaricomycotina (Agaricomycetes)
  • Class: Agaricomycetes (Agaricomycetes)
  • Subclass: Agaricomycetidae (Agaricomycetes)
  • Order: Agaricales (Agaric or Lamellar)
  • Family: Agaricaceae (Champignon)
  • Genus: Leucoagaricus (Belochampignon)
  • Species: Leucoagaricus barssii (Long-root Belochampignon)

Other names:

  • Lepiota barssii
  • Lepiota macrorhiza
  • Lepiota pinguipes
  • Leucoagaricus macrorhizus
  • Leucoagaricus pinguipes
  • Leucoagaricus pseudocinerascens
  • Leucoagaricus macrorhizus

Leucoagaricus barssiiDescription:

An edible mushroom of the Champignon family (Agaricaceae) with a characteristic convex-outstretched cap.

The hat is 4 to 13 cm in diameter, at first it has a hemispherical shape, and later it is wide-convex with or without an elevation in the center. The edge of the cap in young mushrooms can be turned up, which then straightens or sometimes rises. The surface of the cap is scaly or fleecy, grayish-brown or whitish with a darker color in the center.

The pulp is white, and under the skin is grayish, dense and has a strong mushroom smell and walnut taste.

The hymenophore is lamellar with free and thin cream-colored plates. When damaged, the plates do not darken, but when dry they turn brown. There are also many records available.

Spore sac of whitish-cream color. Spores are oval or ellipsoidal, dextrinoid, sizes: 6.5-8.5 - 4-5 microns.

The stem of the mushroom is from 4 to 8-12 (usually 10) cm long and 1.5-2.5 cm thick, tapers towards the base and has a fusiform or clavate shape. The base is deeply embedded in the ground with long tapered underground formations. It turns brown when touched. The leg has a simple white ring, which can be located in the upper or middle part, or not.

Fruiting from June to October.


It is found in the countries of Eurasia, Australia and North America. In Russia, it is distributed in the vicinity of Rostov-on-Don, and is unknown in other regions of the country. Grows in the UK, France, Ukraine, Italy, Armenia. This is a rather rare mushroom, more often found in gardens, parks, roadsides, as well as in arable land, fields and in thickets of ruderals. It can grow both singly and in small groups.