Amanita is a striking and clearly marked genus of the Agaricaceae or gill fungi, characterized by hyaline spores which are white in mass and by the possession of both an annulus and a volva. The volva, or cup at the base, is composed of the remnants of the outer or universal veil, a tissue which surrounds the young sporophore in the button stage and which is broken when the stipe elongates.
Proceedings of the Iowa Academy of Science
©1925 Iowa Academy of Science, Inc.
Martin, G. W.
"Some Amanitas from Eastern Iowa,"
Proceedings of the Iowa Academy of Science, 32(1), 205-217.
Available at: https://scholarworks.uni.edu/pias/vol32/iss1/31