Smooth, yellowish-green to olive-brown cap; white gills; white stem; membranous skirt on stem; cup-like structure around the base of the stem.A more detailed description:
Cap: The young caps are close to hemispherical in shape but then flatten as they expand. When fully open they are gently curved and smooth. The colour is usually yellowish green, but may sometimes be olive to light brown. The fully open caps are commonly 10-15 centimetres in diameter. However, you can find fully mature Deathcaps with caps under 10 centimetres across, occasionally even as little as 5 centimetres. Much depends on what the weather has been doing. The cap is slightly sticky in wet weather but dry and shiny in dry weather.
Gills: White. The gills don’t reach the stem.
Stem: The stem is white and from 5 to 15 centimetres long and 1 to 2 centimetres in diameter. The base of the stem is bulbous (up to 4 centimetres in diameter) and is contained within a cup-like structure (called a volva). Sometimes the bulbous base and the volva will be partially buried in the soil or hidden by grasses and leaf litter. Occasionally the volva is poorly developed.
There is usually a loose, white, skirt-like membrane (called a ring) around the upper part of the stem, but it’s not too hard to rub off this ring if you handle the mushroom roughly. At an earlier stage that membrane would have stretched from the stem to the edge of the cap and covered the young gills.
Spore print: White
Universal veil: When the Deathcap is still fairly small, it is wrapped up in a smooth, white skin - called a universal veil. As the stem lengthens and the cap expands, the Deathcap breaks through that veil. The cup-like volva at the base of the stem is a remnant of that universal veil. For a short time a part of the universal veil may stay on the cap as a white patch, but this soon disappears. The photos show such patches on some of the smaller mushrooms that have not yet fully developed.
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