This is a medium to large, fleshy agaric with greenish olive cap, whitish stem, ring, no patches but distinctive volval sheath. As the volva, which may be hidden by leaf litter, is a distinctive and diagnostic feature, it is important to remove some debris to check for it.
at first round to egg-shaped and then flat. Varies greatly in colour from gray-white to green and yellow brown and has dark radial lines from the center. Sometimes with lots of veil remnants. Gills
free, close, white, can turn yellow. Stem
white with a scattering of grayish-olive scales and with a swollen, ragged, sac-like white volva (base). Ring white or colored like the stem, broad, thin, persistent.
Some Volvariella species look similar to older speciemens of Amanita phalloides. They are distinguished by a pale pink spore deposit and lack of a stem ring.
on the First Nature Web site.
on the MushroomExpert.Com Web site.