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Macro Mushroom

Edible Edible
Autumn Autumn
Spring Spring
Summer Summer

Occasional, but being a large mushroom can often be seen from a distance. Can easily be confused with the Horse Mushroom but both are great tasting mushrooms so it’s not a problem.

Mushroom Type
Common Names Macro Mushroom, Madarch Mawr y Maes (CY), Pieczarka Wielkozarodnikowa (PL), Nagyspórás Csiperke (HU)
Scientific Name Agaricus crocodilinus
Synonyms Agaricus macrosporus, Agaricus urinascens
Season Start May
Season End Nov
Average Mushroom height (CM) 8-14
Average Cap width (CM) 10-16 but can be found up to 25cm
Please note that each and every mushroom you come across may vary in appearance to these photos.


10 to 25 cm when mature. Convex opening out flat becoming scaled and splitting at the edges when mature. Can remains of the veil hanging on the edges. Off-white sometimes with a pale yellow or brown flush.


Crowded and free of the stem. Starting pale pink and turning to brown then almost black.


8-14 cm long, 2-3.5 cm diameter. White/cream and covered in floccules below the skirt. The stem tapers towards both the cap and base.


Has a flimsy, superior skirt with floccules on the underside.


White and firm, flushing red/pink in the stem when cut.


Pastures, lawns and anywhere grassy. Growing in rings or sometimes individually.

Possible Confusion

The toxic Yellow Stainer (Agaricus xanthodermus), but this mushrooms flesh stains chrome yellow when bruised or cut and smells of phenol or Indian ink.
The Horse Mushroom (Agaricus arvensis) looks similar but has a smooth stem, unlike the floccule covered stem, below the skirt, of the Macro Mushroom.

Spore Print

Brown. Ellipsoid.

Taste / Smell

Mushroomy with a hint of almond or aniseed. Should be cooked before consumption. Smells of almonds to some, aniseed to others.



Other Facts

Even when young these are always full of maggots.


10 comments for Macro Mushroom

  1. Andy Webb says:

    Really like the taste of this one

  2. Steve Bush says:

    Just eating a huge one now, and tastes fantastic, it was totally free of maggots, amazingly. Great texture and flavour. Seem to be a lot about this year, usually a rare find.

  3. Jim says:

    I think I found 2 of these clumped together, they weighed over 500 grams each and the bulbous stem was at least 15 centimeters long.smelled very good, no sign of maggots.

  4. Barbara Milligan says:

    Just found a clump of them. Will have them for supper tonight. No maggots and in beautiful condition apart from the ones someone ground into the grass. Found 15th December 2019.

  5. Marie Havers says:

    Can I ask an opinion ?
    I have small squat mushrooms white with pink/brown gills skirt really sits on them and short thick stem ….
    Clean white when cut with a knife and brownish when left several hours on end And no smell .
    Found in Dartmoor in meadow near sheep.

    1. Eric Biggane says:

      Sorry for the late reply, they sound like Agarics but I wouldn’t be able to identify them to species as smell is an important id for this family. If they smell unpleasant and like ink or phenol then they are the toxic Yellow Stainer, if they smell of aniseed, almonds or pleasantly of mushroom they are one of the edible members of the family. The unpleasant smell is enhanced if the mushrooms are cooked.

  6. Hoggster says:

    Just found a 40 ft troop on a northern Essex airfield, up to nearly 50cms.. look amazing with blushing stems and taste even better, back tomorrow to get some for drying.

  7. Stephen Tullett says:

    Found some specimens in hospital grounds to the North of London, I picked the best youngest one and ended up with about a quarter of it that wasn’t maggotty but the taste is really excellent and strong, especially fried in a little oil and butter mix. The stems blushing red threw me until I chanced upon descriptions of A. Macro. I didn’t detect any urine smell, just very mushroomy (maybe that’s the same thing to some noses!)

  8. Donald Graham says:

    Staying in Collon notice these big mushrooms. Checked it out. Wonderful and tasty

  9. Chris Jepson-Brown says:

    These seem to be the commonest agaricus in my neck of the woods (upland, mooredge pasture on acid soils in the South Pennines). A good, tasty one.

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