Agaricus xanthodermus (or is it A. flavescens?) Must be studied. The squamules on the cap were not distinctly yellow, though the surface appeared suffused with that color, exactly as in A. arvensis. Secondary ring present on the lower surface of the other. It was split, as shown. Gills a little brighter pink than in A. arvensis. The plant was already somewhat old when I received it. The interior of the stem was completely riddled by larvae.
Louis C. C. Krieger
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Common names were obtained from the following sources:
Miller, Orson K. and David F. Farr. An index of the common fungi of North America, synonymy and common names. Vaduz [Liechtenstein]: J. Cramer, 1975. 206 p.
Lincoff, Gary. The National Audubon Society field guide to North American mushrooms. New York: Knopf: Distributed by Random House, c1998. 926 p.
Smith, Alexander H. The mushroom hunter's field guide. Ann Arbor: Univ. of Michigan Press, c1980. 316 p.