Panaeolus papilionaceus

• Cap: 1 – 5 cm across, obtusely conic, grayish brown, not hygrophanous, becoming campanulate in age, margin adorned with white toothlike partial veil fragments when young, flesh thin.
• Gills: adnate to adnexed close to crowded, one or two tiers of intermediate gills, pale gray, acquiring a mottled, blackish appearance in age, with whitish edges.
• Spores: 12 - 18 x 7-10 µm, elliptical, smooth, with an apical pore, spore print black.
• Stipe: 6 – 12 cm by 2 – 4 mm, gray-brown to reddish brown, darker where handled, paler toward the apex, fibrous and pruinose.
• Odor: Mild.
• Taste: Unappetizing.
• Microscopic features: Basidia 4-sterigmate; abruptly clavate. Cheilocystidia abundant; subcylindric, often subcapitate or capitate.

Occurring singly, gregariously, or caespitosely on cow/horse dung, moose droppings, and in pastures. Widely distributed in North America in Spring, Summer, and Fall and through the Winter in warmer climates. It can be found in countries including[1] Canada (Alberta,[2] British Columbia), the United States (Alabama, Alaska, California,[2] Colorado, Florida, Georgia,[2] Indiana,[2] Louisiana,[2] Maine, Massachusetts, Missouri, Montana,[2] New Mexico, New York, Oklahoma, Texas,[2] Washington,[2]), the Caribbean (Bahamas, Cuba, San Vincent Island), Chile, Colombia, Uruguay, France, The Netherlands, North Macedonia, Mexico,[2] Norway, Slovenia,[2] South Africa, Uganda, China, Iran, Lithuania, Kuwait, and the Philippines.

Panaeolus papilionaceus is inedible,[3] and is neither choice in flavor nor substantial in mass. While similar looking species, such as Panaeolus cinctulus, do contain psilocybin, Panaeolus papilionaceus does not[4]

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  Panaeolus papilionaceus var. papilionaceus
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• List of Panaeolus species

• Mushroom Expert - Panaeolus papilionaceus
• Mykoweb - Panaeolus papilionaceus
• Observations on Mushroom Observer