Mower's Mushroom

Panaeolus foenisecii

''Panaeolus foenisecii'', commonly called the mower's mushroom, haymaker or brown hay mushroom, is a very common and widely distributed little brown mushroom often found on lawns.
Mower's Mushroom This is a picture of Mower's Mushroom at Alpha Ridge Park in Howard County, Maryland. Geotagged,Panaeolus foenisecii,Spring,United States

Appearance

*Cap: 1.5 to 3 cm across, conic to convex, chestnut brown to tan, hygrophanous, often with a dark band around the margin which fades as the mushroom dries.
⤷ Gills: Broad, adnate, brown with lighter edges, becoming mottled as the spores mature.
⤷ Stipe: 4 to 6 cm by 2 to 3 mm, fragile, hollow, white to light brown, pruinose and slightly striate.
⤷ Taste: A slightly unpleasant nutty fungal taste.
⤷ Odor: Nutty, slightly unpleasant.
⤷ Spore print: Dark walnut brown.
⤷ Microscopic features: Spores measure 12 - 17 x 7 - 11 μm, subfusoid to lemon shaped, rough, dextrinoid, with an apical germ pore. Cheilocystidia subfusoid to cylindric or subcapitate, often wavy, up to 50 μm long. Pleurocystidia absent, but some authors report inconspicuous "pseudocystidia". The pileipellis a cellular cuticle with subglobose elements and has pileocystidia.

References:

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Taxonomy
KingdomFungi
DivisionBasidiomycota
ClassAgaricomycetes
OrderAgaricales
FamilyBolbitiaceae
GenusPanaeolus
SpeciesP. foenisecii