Also known as Lawnmower's Mushroom, Mower's Mushroom, Haymaker, Brown Hay Mushroom
Haymaker's mushrooms dot suburban lawns, pastures, and grassy parks throughout spring, summer, and autumn, sprouting in clusters shortly after warm morning rain. Their bell-shaped caps change color dramatically as they dry, fading from a dark reddish-chocolate hue to a pale buff-tan from the center outward. These small saprotrophic fungi act as vital natural recyclers, breaking down dead root matter and thatch beneath turfgrass.
Lawn MushroomHygrophanousSaprotrophic
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—countries
—peak records
Not EvaluatedConservation statusIUCN Red List categoriesLCNTVUENCREWEXNot Evaluated — not placed on the risk ladderRed List categories, explained →
Key facts
Diet & prey
Dead Grass Roots
Organic Thatch
Decaying Plant Matter
Predators
Slugs
Fungus Gnats
Nematodes
ThreatsExcessive lawn fungicides and chemical turf treatments
HabitatsLawns, pastures, golf courses, and grassy fields
Life spanIndividual caps last 2 to 4 days; underground mycelium persists indefinitely
Size / weightNot available
Classification
FamilyBolbitiaceae
SpeciesPanaeolina foenisecii
Range & activity
Range data is not available yet.
Safe observation
Interaction riskHigh
Low
Moderate
High
Very high
Why interaction risk is high
Ingestion can cause gastrointestinal distress; wild mushrooms should never be eaten as toxic look-alikes exist.
Why it is dangerous
Contains serotonin compounds and mild gastrointestinal toxins that induce nausea and stomach cramps if consumed.
How to recognize a risky encounter
Recognized by its small, brownish bell cap that fades tan upon drying and mottled dark gills.
What to do
Leave growing mushrooms undisturbed on lawns and ensure young children or pets do not consume them.
Responsible observation
Spore Printing: Place a fresh cap face down on paper to observe dark brownish-black spores.
Lawn Care: Allow caps to mature undisturbed so their mycelium can naturally break down thatch.
Pet Safety: Keep curious dogs from nibbling wild lawn mushrooms during damp morning walks.
