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Panaeolina foenisecii Haymaker's Mushroom
Possibly the most common of the lawn fungi in the eastern regions. The gills are mottled and the spore print is black. It is reported as poisonous as it contains small quantities of the psilocybin group of hallucinogens. There are probably legions of small children who have swallowed this mushroom as they crawl across the lawn. If they are spotted then they will have the unfortunate experience of having their stomach pumped. As far as I know, however, there is only once case on record when this mushroom caused symptoms serious enough to require medical attention. Be safe. Don't eat it!
Caps are 1-3 cm across, dry, smooth or cracking in age, convex to bell-shaped, grey-brown to smoky or red-brown, drying buff. Gills are attached, close, broad, dark brown to purple-black, and mottled. Stalks are up to 8 cm tall, slender, smooth, and pale brown. Spore prints are purple-brown. This is the commonest of some related little brown mushrooms (LBMs) that fruit on lawns. Also known as Panaeolus foenisecii.