Mushroom Identification for Lawn and Yard Mushrooms

Lawn mushroom identification comes down to three things you can record in two minutes, and the order matters because the first one is the one people skip.

• The base of the stem. Dig the whole mushroom out instead of snapping it. A cup-like sac at the base, called a volva, is the mark of Amanita, the genus that includes the death cap and destroying angels. It sits below soil level and breaks off easily.
• Gill colour and attachment. Free white gills on a pale cap point one way; brown, grey-mottled or decurrent gills point somewhere else entirely. Note whether the gills run down the stem, stop at it, or stop short of it.
• Spore print. Cut the cap off, lay it gills-down on white paper with a glass over it, and wait a few hours. Chlorophyllum molybdites is described as the only large mushroom with a green spore print, and a giant puffball prints greenish brown at maturity.

You can also photograph it with the app and it will identify it, but record the base and the spore print anyway — those two are what a doctor or mycologist will ask for.

This is the default lawn mushroom across most of the country. Panaeolus foenisecii, often called the lawnmower's mushroom or haymaker, is one of the most widespread fungi in North America and fruits in large numbers on turf after rain. Caps are small and brown, fading in bands as they dry, and the gills are mottled dark grey-brown.

The group it belongs to is informally called little brown mushrooms, and it is where identification is hardest. Several genuinely dangerous species are small and brown, including Galerina marginata and Conocybe filaris, both of which contain the same class of liver toxins as the death cap.

On toddlers and lawnmower's mushroom specifically, a multicentre study of accidental ingestions in Germany and Switzerland, indexed on PubMed, reported no clinically relevant effects after children ate five or fewer identified specimens. That is a reassuring finding about one identified species after the fact — not a reason to relax when you do not know what your child picked up. Call Poison Control at 1-800-222-1222 and let them make that call.

More detail on this group is on brown mushrooms in yard.

Large white or cream mushrooms with a ring on the stem are the group to be most careful about, because it contains the species responsible for more North American mushroom poisonings than any other.

Chlorophyllum molybdites, the green-spored parasol, is one of the most common lawn and pasture mushrooms in the country, absent mainly from the Pacific Northwest. It has free white gills that turn dull green with age, a stem ring, and a green spore print. It is repeatedly confused with shaggy parasols and shaggy manes, and reported symptoms are severe vomiting, diarrhoea and cramps starting one to three hours after eating.

And the one that matters most: white Amanita species, including the destroying angels Amanita bisporigera and Amanita ocreata, which grow in lawns and landscaped ground near host trees. Full detail on white mushrooms in yard.

A ring or arc of small tan mushrooms is usually a fairy ring. Iowa State University Extension attributes fairy rings to 50 or more species of soil-inhabiting fungi, and Illinois Extension puts typical rings at 2 to 15 feet across.

The classic fairy ring species, Marasmius oreades, is well documented by the Missouri Department of Conservation: cap ½ to 2 inches wide, pale tan to buff to reddish brown, bell-shaped becoming convex and knobbed; gills broadly spaced, off-white, attached or free; stalk 1 to 3 inches long, dry, tough and feltlike; white spore print; fruiting May to September in lawns and meadows, often in arcs or circles.

The Missouri guide also names the lookalikes that make this a poor mushroom for beginners: poisonous Clitocybe and Inocybe species. Clitocybe dealbata, the sweating mushroom, is described as grey-pink with gills that run down the stalk, and it grows in exactly the same lawns and rings. The gill attachment is the split: decurrent on Clitocybe, attached or free on Marasmius.

• Round white balls with no stem or gills. Puffballs and earthballs. The giant puffball is described by the Missouri Department of Conservation as a huge white smooth ball, pure white and marshmallow-textured inside when young, turning yellowish green with age. A young Amanita still wrapped in its universal veil looks like a small puffball from the outside, which is why cutting one from top to bottom is the standard check. See white ball mushroom in yard.
• Slimy stalks that smell of rotting meat. Stinkhorns. NC State Extension describes them emerging from egg-like structures in mulch and stinking to attract flies, which carry the spore slime away. See stinkhorn mushroom in yard.

Naming a mushroom is not the same as clearing it. Poison Control's position is that eating any amount of any wild mushroom can be very dangerous, because look-alike mushrooms can be very different, and that only experts in mushroom identification can tell the difference. This site follows that line: no page here will tell you a wild mushroom is safe to eat.

If someone has eaten any part of a lawn mushroom, call 1-800-222-1222 in the United States immediately, before symptoms appear. Poison specialists work with mycologists to identify the specimen and with hospital staff on treatment, and the service is free and available 24 hours a day. Keep a whole specimen, base included, in a paper bag.

For a dog or cat, call your veterinarian or ASPCA Animal Poison Control at (888) 426-4435.

Yes, as a first step, but a photo alone is not reliable enough to decide anything about safety. In a 2023 study in Clinical Toxicology, researchers from the Victorian Poisons Information Centre in Australia tested three popular apps on photographs of 78 specimens from real poisoning enquiries, checked by an expert mycologist. The best app named 49% of specimens correctly and the other two 35% each. For poisonous mushrooms the best score was 44%, and the death cap was sometimes named wrongly. The authors concluded apps are not reliable enough to exclude exposure to poisonous mushrooms when used alone.

That is why this page asks for more than one photo. The MushroomIdentifier.org tool recommends up to six pictures: the cap from above, a side view, the gills or pores, the stem base and the surroundings. Mushroom.World's identification key relies on the spore print colour first.

Google Lens can search with a photo. Google's help page says you can take a photo of a plant, for example, and use it to search for information or similar images. For a mushroom, that returns look-alike pictures and web pages, not a checked identification, and it faces the same limits as dedicated apps: it cannot see the stem base if it is still in the soil, the spore print colour, the smell or whether the flesh bruises.

Use any photo result, from Google, iNaturalist or this app, as a lead to check against the features on this page, never as permission to handle a mushroom carelessly or eat it.

There is no rule or home test. Poison Control says that unless you are very experienced in mushroom identification you cannot tell poisonous from safe species, that look-alikes learned in one part of the country can fool you in another, and that cooking does not make a poisonous mushroom safe. The only way to know is an expert identification of the actual specimen.

What you can do is recognise the high-risk groups on sight and treat them as dangerous: white mushrooms with a ring and a cup at the base (possible destroying angels), large white parasols that print green (Chlorophyllum molybdites), and small brown mushrooms, which include the deadly funeral bell.

Some university diagnostic labs identify mushrooms. Montana State University's Schutter Diagnostic Lab publishes clear submission rules that work as a general checklist:

• Dig out the whole mushroom with a pocket knife so the base does not break off, and collect several at different stages if you can.
• Wrap each one separately in wax paper or newspaper. Do not use plastic bags; the lab says they make mushrooms spoil.
• Deliver or mail it quickly, and avoid mailing on Thursday or Friday so it does not sit over a weekend.
• Write down the collection date and place, what it grew on (wood, soil, lawn, pasture), nearby tree species, and whether it grew alone or in clusters.
• Say why you are asking: curiosity, removal, poisoning concern or food.
• Optional spore print: cap gills-down on paper for 2 to 24 hours.

The lab's page does not list a fee; contact it directly to ask. If someone has already eaten the mushroom, skip the lab and call Poison Control at 1-800-222-1222 (U.S.) now, before symptoms start.

Write these down before you ask anyone, including the app. They are the features identification keys such as Mushroom.World sort by.

• Spore print colour: white, cream, pink, brown, purple-brown, black or green.
• Cap: shape, colour, width, and whether it is smooth, scaly or sticky.
• Underside: gills, pores or ridges; how the gills attach (free, attached, running down the stem).
• Stem: ring or no ring; a cup or bulb at the base.
• Growing on: soil, lawn, wood, mulch or roots; alone, scattered, in a ring or in a cluster.
• Nearby trees and the date.

Then compare with the lawn groups above, or start with mushrooms in yard.

The two identification tools that rank highest for this question, MushroomIdentifier.org and Mushroom.World's identifier, sort mushrooms by the same handful of features. Answer these in order and you will usually land in the right group, which is as far as a photo can take you.

• What is it growing on? Wood (a stump, log, buried root or wood chips) or soil and grass. Small brown mushrooms in clusters on wood include the deadly funeral bell; bright orange clusters on wood suggest the jack-o'-lantern.
• What is under the cap? Gills, pores (a sponge-like surface), teeth, or nothing at all. A ball with no underside is a puffball, an earthball or an egg stage: cut it from top to bottom and see white ball mushroom in yard.
• What is at the base of the stem? Dig it out. A sac-like cup or a bulb, with a ring on the stem, points to Amanita, the group that includes the death cap.
• What colour is the spore print? Mushroom.World uses spore colour as its first filter. How to make one and read it: mushroom spore print.
• What else do you notice? MushroomIdentifier.org asks for smell, colour change when cut or bruised, texture, nearby plants, whether it grows alone or in clusters, and the date and location.

If the answers point to a group with deadly members, stop there and treat the mushroom as dangerous. Mushroom.World itself warns that there is a significant chance, especially for beginners, of getting an identification wrong, and both tools say their results must never be used to decide whether a mushroom can be eaten.

Whether you ask the app, a local mycological society, an online forum or an extension lab, the answer is only as good as the pictures. MushroomIdentifier.org's upload guide asks for:

• The cap from directly above, showing colour, texture, scales or warts.
• The underside, showing gills, pores or teeth and how they attach.
• A side view showing the cap shape and where it meets the stem.
• The whole stem and base, including any sac, ring or rooting part, after digging it out.
• The habitat: what it grew on, nearby plants, alone or in a cluster.
• Optional: a lengthwise cross-section showing flesh colour and whether the stem is hollow, and a spore print on white and dark paper.

Add the date and region, note the smell and any colour change after cutting, and put a coin or ruler in one photo for scale. If anyone has eaten the mushroom, call Poison Control at 1-800-222-1222 (U.S.) first and send photos afterwards.

The common lawn mushrooms in North America fall into about a dozen types. UC IPM's lawn guide names Panaeolus foenisecii, inky caps (Coprinus), Clitocybe, Conocybe and fairy ring fungi such as Marasmius oreades. The Missouri Department of Conservation (MDC) field guide adds the larger species. Each entry below gives the one feature to check first and its risk:

• Lawnmower's mushroom (Panaeolus foenisecii). Small, brown, scattered after rain, with mottled dark gills. It is the most common lawn mushroom. Small brown mushrooms also include deadly Galerina and Conocybe species, so treat them all as unknown.
• Fairy ring mushroom (Marasmius oreades). Tan caps in rings or arcs, widely spaced off-white gills, and a tough stalk. MDC records it May to September. Its look-alike, the poisonous sweating mushroom, has gills that run down the stalk.
• Green-spored parasol (Chlorophyllum molybdites). Large and white with a ring, and a cap 2 to 12 inches wide. It prints green and grows in lawns July to September, often in rings. MDC says it is poisonous, not deadly, but can cause vomiting and diarrhoea severe enough to need hospital care. Details.
• Shaggy mane (Coprinus comatus). Tall, white and shaggy, blackening from the cap edge upward. MDC records it September to October.
• Common ink cap (Coprinopsis atramentaria). A smooth grey cluster over buried wood. It reacts with alcohol. Details.
• Giant puffball (Calvatia gigantea). A white ball 8 to 20 inches wide, May to October (MDC). Cut every white ball top to bottom: a young Amanita inside its veil looks the same from outside.
• Destroying angels (Amanita bisporigera, A. ocreata). Pure white, with a ring on the stem and a cup at a base that may be buried, near trees. These are the deadly ones. Details.
• Stinkhorns. Slimy stalks in mulch that smell of rotting meat. Details.
• Bird's nest fungi. Tiny cups, 1 to 25 mm tall, holding egg-like spore packets, on mulch and wood chips. UF/IFAS Extension reports no evidence they are toxic to people or animals.
• Black-staining polypore (Meripilus sumstinei). A rosette up to 32 inches across at the base of an oak that bruises black. It fruits July to September (MDC).

Some are, and the harmless and poisonous ones grow in the same lawns. Of the common types above, the green-spored parasol, the sweating mushroom, the common ink cap (when taken with alcohol), destroying angels and the small brown Galerina and Conocybe species are poisonous. The destroying angels and the small brown species contain liver-damaging toxins. The others are poisonous to different degrees or have not been studied. Poison Control's position is that only experts in mushroom identification can tell them apart.

In practice, this means:

• Treat every lawn mushroom as poisonous until an expert has identified the actual specimen.
• Pick them before children play. UC IPM advises removing all obvious mushrooms from the yard first, because small children put things in their mouths.
• If anyone eats one, call Poison Control at 1-800-222-1222 immediately. For pets, call your vet or ASPCA Animal Poison Control at (888) 426-4435.

The mushrooms you can see usually go away on their own, but the fungus that produces them stays in the soil and can send up more. A mushroom is only the fruiting body of a fungus that lives underground on buried wood, dead roots or thatch. UC IPM notes:

• Removing mushrooms does not kill the underground fungus. It keeps feeding until the organic matter is used up.
• Mushrooms in newly laid sod do not harm the lawn and disappear once irrigation is reduced.
• Slime molds left alone usually disappear in about a week.

Some mushrooms return to the same place every year because their food source is large. MDC says the black-staining polypore and Berkeley's polypore, both large clusters at the base of oaks, can come back in the same spot year after year. Inky caps dissolve within a day or two of appearing.

Pick them as they appear and remove what they are feeding on. Fungicides are not the answer. UC IPM recommends:

• Hand-pick mushrooms as they come up, wearing gloves, and put them in the household bin.
• Dig out buried wood, such as old roots, construction scraps or stump remains, when mushrooms keep coming from one spot.
• Aerate compacted or poorly drained turf.
• Skip fungicides. UC IPM says managing fairy rings in a home lawn with cultural practices is faster and more effective than fungicides.

Step-by-step detail is on how to get rid of mushrooms in lawn.

The largest mushrooms in North American yards are usually one of five, listed here by size with MDC's measurements:

• Berkeley's polypore: a cream-coloured mass up to 3 feet wide at the base of an oak, with caps 3 to 12 inches across, July to October.
• Black-staining polypore: a greyish-yellow rosette up to 32 inches wide at the base of an oak that bruises black, July to September. MDC notes it lives as a parasite in living trees.
• Giant puffball: a smooth white ball 8 to 20 inches wide, sometimes larger, May to October.
• Green-spored parasol: a white cap up to 12 inches wide on a stalk up to 10 inches tall, in lawns, often in rings. It is poisonous.
• Shaggy mane: up to 6 inches tall, white and shaggy, blackening as it matures.

An Amanita is not usually the biggest thing in the lawn, but it is the one that matters most. Any large white mushroom with a ring should be dug out whole to check the base. If a huge cluster keeps appearing at the base of a living tree, it is worth asking an arborist to check the tree.

Fruiting months from the Missouri Department of Conservation field guide. Dates shift with latitude and rain, but the order is a useful clue:

• April to early May: black morels in woods, under ash and tulip poplar, and on burned ground.
• May to September: fairy ring mushrooms.
• May to October: giant puffballs.
• July to September: green-spored parasols and black-staining polypores.
• July to October: Berkeley's polypore.
• September to October: shaggy manes.

A large white ringed mushroom in a lawn in midsummer is more likely to be a green-spored parasol than anything else on this list. But midsummer is also when white Amanitas fruit near trees, so check the base every time.