This is a lethally poisonous, 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.