One fungus that fits into the toxic category is the yellow variant of the American Fly Agaric Mushroom (Amanita muscaria var guessowii). This species is found in deciduous and coniferous woodlands. It's mycelium (root-like structures) are found in the ground and have a symbiotic mycorrhizal relationship with the roots of trees. This means that the mycelium form a coating around the hair roots of trees and help the trees absorb water and minerals. In exchange, the fungi receive sugars from the trees roots.
This variant of the American Fly Agaric has a yellow to orange cap with pinkish, tan, or white "warts" on the top. These warts have a cottony or felt-like appearance. The underside of the cap has white gills. This mushroom emerges from the ground as a "button" or "egg". To the inexperienced mushroom hunter it may appear to be a puffball. This mistaken identity has probably resulted in many cases of poisoning.
Egg or button phase of Amanita muscaria var. guessowii |
Egg or button phase of Amanita muscaria var. guessowii - this one was bright yellow |
Eventually the outside edge of the cap spreads out to a width of up to 9 inches. This cap rests atop white stalk with a bulbous base. There is a fragile skirt-like ring part of the way up the stalk.
American Fly Agaric (yellow variant) - note bulbous base, white gills, and warts |
This species is found much of eastern North America and is particularly common in the Great Lakes region. Because this species is associated with the roots of trees, Fly Agaric mushrooms are often found in large groups and sometimes form arcs or "fairy rings". It is most commonly seen in late summer and fall.
Amanita muscaria var guessowii - note the cottony warts |
Part of a large colony of yellow American Fly Agaric |
Basic Information
THIS SPECIES IS TOXIC!
American Fly Agaric (Yellow variant)
Amanita muscaria var. guessowii
THIS SPECIES IS TOXIC!
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