Amanita

Definition and stakes

Miron Elisha Hard The Mushroom, Edible and Otherwise

Amanitopsis is from Aminita and opsis, resembling; so called because it resembles the Amanita. The principal feature wherein the genus differs from the Amanita is the absence of a collar on the stem. Its species are included among the Amanita by many authors. The spores are white. The gills are free from the stem, and it has a universal veil at first completely enveloping the young plant, which soon breaks it, carrying remnants of it on the pileus, where they appear as scattered warts. It differs from the Lepiota in having a volva.
Source: Gutenberg

Portrait of Thomas Taylor Thomas Taylor Student's Hand-book of Mushrooms of America…

Subgenus Amanita. The Amanitas are usually large and somewhat watery, the flesh brittle rather than tough. The very young plants are enveloped in a membranous wrapper, which breaks apart with the expansion of the plant, leaving a more or less persistent sheath at the base of the stem. The universal veil is distinct and free from the cuticle of the cap. The cap is convex at first, then expanded; in some species naked and smooth; in others, clothed with membranaceous patches of the volva. The stem is distinct from the fleshy substance of the cap, ringed and furnished with a volva or sheath.
Source: Gutenberg

Miron Elisha Hard The Mushroom, Edible and Otherwise

There is nothing in the white gills and hollow stem theory. It is true that the Amanita has both, but it must be known by other characteristics. Again we are told to avoid such as have a viscid cap, or those that change color quickly; this is too sweeping a condemnation for it would cut out several very good species. I think I may safely say there is no known rule by which the good can be distinguished from the bad. The only safe way is to know each species by its own individual peculiarities—to know them as we know our friends.
Source: Gutenberg

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