Shaggy mane mushroom (shaggy ink cap, Coprinus comatus): identification and look-alikes

How to identify a shaggy mane

A shaggy mane starts as a tall white egg or cylinder standing in grass, its surface broken into shaggy, recurved scales like a barrister's wig. Within a day the edge of the cap turns pink, then black, and the whole cap dissolves from the rim upward into black ink, leaving a bare white stem with a small black disc on top. It appears on lawns, verges, paths and freshly disturbed ground after rain, often in lines or groups. It is a common beginner's edible on both sides of the Atlantic, with two conditions: it must be young and white, and it must not be the common ink cap.

Confirm these features

• Cap tall and cylindrical, far taller than wide, white with shaggy upturned scales.
• Gills white when you split a young cap; pink or black means it is past use.
• Black ink forming at the cap edge on older specimens nearby.
• Stem white, smooth, hollow, with a thin ring that moves.
• Growing from soil in grass or disturbed ground, not in a tight cluster from a stump or buried wood.
• Black spore print from a cap that has opened.

Dangerous look-alikes

Common ink cap, inky cap, tippler's bane (Coprinopsis atramentaria)

Tell apart: the cap is grey to grey-brown, egg-shaped and mostly smooth or finely scurfy over the centre, 3–7 cm across (First Nature), opening to a conical bell up to 10 cm (MushroomExpert.com), with no shaggy white scales. The stem is white with reddish-brown fibres toward the base and at most a faint ring zone. It grows in tufts from buried wood, around stumps and at the base of trees, often in parks and on verges where timber is buried under the grass. See shaggy mane vs inky cap.

Risk: poisonous with alcohol. It contains coprine, which blocks the breakdown of alcohol. The North American Mycological Association (NAMA) describes a reaction that can begin minutes after drinking: rapid heartbeat and palpitations, tingling in the arms and legs, warmth and flushing, sometimes headache and heavy limbs. The window differs by source. NAMA says alcohol as much as 5 days after eating the mushrooms can trigger it; the Woodland Trust and First Nature give three days before and after; MykoWeb says several days. There is no agreed short window, so the safe reading is the longest one. Woodland Trust lists nausea and hot flushes as the typical symptoms.

Magpie ink cap (Coprinopsis picacea)

Tell apart: also tall and egg-shaped when young, but the cap is dark brown to grey with white patches of veil standing out against it, the reverse of the shaggy mane's white cap with pale scales (First Nature). Woodland, usually beech.

Risk: not listed as edible by any source on this page. Do not eat.

Green-spored parasol (Chlorophyllum molybdites)

Tell apart: MDC lists it as a lookalike for the shaggy mane in lawns: its cap is rounder and flatter rather than a tall cylinder, it never turns to ink, and its spore print is green, not black. The full page is at green-spored parasol.

Risk: poisonous; the most commonly reported cause of mushroom poisoning in the US, with severe vomiting and diarrhea 1 to 2 hours after eating.

Other white lawn mushrooms

Tell apart: a shaggy white Amanita such as Thiers' amanita, or a white field mushroom, never dissolves into ink and gives a white or brown spore print. If the cap is not a tall shaggy cylinder, it is not a shaggy mane. The mushrooms in the lawn guide sorts the common ones.

Where and when it grows

The shaggy mane is a saprobe of disturbed and grassy ground. First Nature lists grass verges, lawns, footpath edges and open woodland across Britain and Ireland from April to November, most plentiful in summer and autumn soon after rain; Kent Wildlife Trust adds roadside verges, parkland and gardens, May to November. In North America MushroomExpert.com records it on lawns, wood chips and hard-packed ground such as the edges of dirt roads in summer and fall, and MDC notes that it can push up through asphalt parking lots and return to the same spot for several years. It is widely distributed across North America and Europe. The common ink cap shares the verges and parks but needs wood underneath: look for a stump, a felled tree or a lawn laid over buried timber.

Before you eat any

Every source here puts the same two conditions on the edible verdict: young and white, and fast. First Nature says to use them within an hour or two of gathering, because they deteriorate even in the fridge; MDC says to cook them soon after harvesting, that a shaggy mane lasts about 24 hours from emerging to liquefying, and that once picked it can dissolve within a few hours. MDC also advises eating only a small amount the first time you try any new wild mushroom. Cook them. On alcohol: the sources we checked attach the coprine warning to the common ink cap, not to the shaggy mane, but if there is any doubt which species you have, skip alcohol for several days either side. Then confirm the find with someone experienced, in person. No field guide verdict, and no app, is a clearance to eat.

Using an app to check a find

A photo of a shaggy white cylinder in grass gives an app a lot to work with: the shape, the scales, the ink forming on older caps. It cannot show the state of the gills inside a closed cap, and it cannot show whether a smooth grey cap nearby is growing from buried wood. Mycoscout leads with the edibility verdict, shows its confidence, and names the look-alikes to rule out, including the common ink cap and its alcohol reaction, so you know what to check before anything else. It is a field companion, not a clearance to eat.

Frequently asked questions