Backyard Mushroom Identification: Common Lawn Species

To identify a backyard mushroom, note where it grows, how it grows, and what is under the cap, then compare it with the common lawn species below. Record:

• Where: open lawn, mulch or garden bed, the base of a tree, or over buried wood. UC IPM explains that lawn mushrooms grow from buried construction lumber, dead tree roots or other organic matter.
• How: alone, in clusters, or in a ring or arc.
• Underside: gills, or pores like a sponge. Holden Forests and Gardens uses pores to recognize boletes.
• Spore print color: the color of spores dropped by a cap left gills-down on paper. A green print on a large lawn mushroom points to the false parasol, which Wikipedia calls the only large mushroom with a green spore print.
• Smell and color changes, for stinkhorns and inky caps.

Identification is for knowing what is growing, never for deciding what to eat. Holden Forests and Gardens states its own lawn guide is not for identifying fungi for food or medicine.

The three top-ranking lawn guides describe these species:

• Fairy ring mushroom (Marasmius oreades): small, tan to brown, umbrella-shaped caps in a circle in the grass (Mushroom Appreciation).
• False parasol or 'the vomiter' (Chlorophyllum molybdites): caps 4 to 8 in (American Mushrooms) or 8 to 30 cm (Wikipedia), whitish with brown scales, often in fairy rings, gills turning green, green spores. Causes acute stomach poisoning.
• Lawnmower's mushroom (Panaeolina foenisecii): small, brown and conical, 0.5 to 1.5 in; poisonous and especially dangerous to small children (American Mushrooms).
• Milky conecap (Conocybe apala): small, delicate, white, appearing first thing in the morning; may be mildly toxic (Mushroom Appreciation).
• Meadow mushrooms (Agaricus): have both edible and toxic look-alikes, including the deadly destroying angel. Agaricus placomyces, 3 to 5 in, causes short-term stomach symptoms (American Mushrooms).
• Inky caps (Coprinus): conical caps that dissolve into black ink, in clusters.
• Puffballs (Lycoperdon): round and white, marble- to volleyball-sized.
• Stinkhorns (Phallus and relatives): red, orange or yellow, with a strong foul smell that draws insects.
• Boletes and russulas near trees: boletes have pores; russulas have bright white gills and stems and often red caps. Both partner with tree roots (Holden).
• Ringless honey mushroom (Armillaria tabescens): clusters at the base of mature trees in early fall, with no ring on the stem; a wood-rotting parasite, and it can be confused with the poisonous jack-o'-lantern mushroom (Holden).
• Flowerpot parasol (Leucocoprinus birnbaumii): about 1 in, common in plant pots even indoors; causes short-term stomach symptoms (American Mushrooms).
• Dog vomit slime mold (Fuligo septica): a bright yellow, puffy mass on mulch. It is a slime mold, not a fungus, and usually disappears within days (Holden).

No survey counts them, and the answer changes with region, season and lawn. The same few appear on every top-ranking list: fairy ring mushrooms, lawnmower's mushrooms, conecaps, inky caps, puffballs, meadow mushrooms, stinkhorns and the false parasol. The false parasol matters most because it is common on lawns and, according to Wikipedia, the most frequently eaten poisonous mushroom in North America, usually mistaken for the shaggy parasol or the parasol mushroom.

Do not eat it. UC IPM states that many lawn species are poisonous and only an expert can tell edible from poisonous ones. Poison Control says never to eat a wild mushroom unless an expert has identified it, that look-alikes fool careful foragers, and that cooking does not make a poisonous mushroom safe; fumes from cooking some species can poison you. American Mushrooms adds that any poisoning case must rule out the often-fatal genera Amanita, Lepiota and Galerina. Even the lawn species other sites call edible have dangerous look-alikes, including the deadly destroying angel.

If someone may have eaten a wild mushroom, call Poison Control at 1-800-222-1222 right away and keep the mushroom (Poison Control). False parasol symptoms, vomiting, diarrhea and stomach pain, begin 1 to 3 hours after eating (Wikipedia). Call right away rather than waiting for symptoms. Our wild mushroom identifier guide explains why photo apps cannot settle edibility.

UC IPM advises removing all obvious mushrooms from the yard before children play there, and American Mushrooms recommends removing any that dogs or young children might graze on. Poison Control stresses supervising children outdoors, because to a small child a mushroom can look like food. If a dog or cat eats a lawn mushroom, call your veterinarian or Pet Poison Helpline at (855) 764-7661 and bring the mushroom or a photo.

Most lawn mushrooms do no harm to the grass. Holden Forests and Gardens says that nine times out of ten its advice is to leave them be, since they are decomposers or partners of tree roots. When you want fewer of them:

• Pick or mow them off to stop spores and keep them from children and pets, knowing that removing them does not kill the underground mycelium (UC IPM).
• Reduce the food and water: aerate, remove thatch, and fix overwatering or poor drainage (UC IPM).
• For fairy rings, UC IPM describes green bands 1 to 12 or more feet across; in some the soil becomes so full of fungus that water cannot soak in. Aerating and nitrogen fertilizer help; fungicides need repeated, well-timed applications and work less well than these practices.
• Clusters at the base of a tree, such as the ringless honey mushroom, can mean wood rot. Holden suggests calling an arborist.

American Mushrooms sums it up: you cannot get rid of lawn mushrooms without getting rid of the lawn.

Take a photo from above, one from the side showing the stem, one of the underside, and one of the spot where it grows, including any ring or nearby tree. Add the spore print color if you made one. NatureLens can suggest a name from these photos, with free scans every day. Use the name to learn what is in your yard and to talk to an expert; never use it to decide whether a mushroom is safe to eat.

Research and drafting for this page used AI assistance. Every measurement, date and claim was then checked against the sources listed below, which were opened and read on 2026-09-25. Where two sources give different numbers, both are shown.