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Volvariella

Field characters

Pileus: broadly convex and smooth or with fibrils, generally whitish to brownish in color
Annulus: absent
Stipe: central, cleanly separable from the cap with a volva
Stature: Vaginitoid
Ecology: saprophyte on a variety of substrates

Micro characters

Basidiospores: inamyloid, smooth with a thickish cell wall
Hyphae: without clamp connections
Spore Print: pinkish tan
Lamellae: free from the stipe,crowded
Lamellar Trama: convergent

Notes

Volvariella (Volvaria in older texts) is very easy to identify. As far as I know it is the only other genus, besides Amanita, with a volva, the remains of the universal veil appearing as a sac at the base of the stipe.

The pink spore print, no annulus and a volva = Volvariella.

The only species I have found to date resembles V. bombycina, the tree Volvariella. However, that species is supposed to have 100 micrometer long cystidia and my specimen has none.