annulus

• Nom désignant une structure en forme d'anneau ou une forme torique ; en mycologie, reste du voile partiel entourant le pied d'un champignon mature comme un collier.

A noun referring to a ring-shaped structure or toroidal form; in mycology, it denotes the remnant of the partial veil that encircles the stem of a mature mushroom like a collar.

1. Ring-shaped structureC1formal

   A geometric shape resembling a ring or a torus, formed by two concentric circles.

   Anneau (géométrie)

   • The diagram shows an annulus with an inner radius of 2 cm and an outer radius of 5 cm.
   • In mathematics, the area of an annulus is calculated by subtracting the area of the inner circle from the outer one.
   • The planet Saturn is surrounded by a complex system of annuli.

   Synonymescollarhaloloopring

2. Fungal ringC2formalscientific

   A remnant of the partial veil that encircles the stem of a mature mushroom like a collar.

   Anneau (mycologie)

   • The mushroom had a distinct annulus near the top of its stem.
   • When identifying fungi, the presence or absence of an annulus is a key characteristic.
   • The annulus of the Amanita muscaria is a prominent feature.

   Synonymesringskirt