Identifying Field Mushrooms and how to dry them – No Fear Foraging!

I’ve been collecting field mushrooms ever since I was a kid, when I used to go out foraging with my Dad. Now, I often go out looking for field mushrooms with my family, and we all enjoy spotting the flashes of white in the grass and running to get there first!

But how do you go about identifying field mushrooms, and how can you be sure you don’t have anything more sinister in your foraging bag?

Photo by Strobilomyces

Lots of folk worry about foraging for mushrooms, and they are right to be. Get it wrong and you could end up in hospital! The good thing with field mushrooms though is that they are easy to identify, once you have a little know-how.

When do Field Mushrooms Grow in the UK?

Field mushrooms (Agaricus campestris) start popping up from July to October. They mostly grow in pasture land, and particularly seem to like field where sheep have been. You will also find them growing in other grassy places, such as along the edges of a hedgerow.

Identifying Field Mushrooms

The gills of the young field mushroom are a dusky pink colour which changes to brown and then black as the mushroom matures.

Mature Field Mushrooms

Don’t Confuse With…

The Yellow Stainer! This is a poisonous mushroom that, although won’t kill you, could give you a belly ache. Although some people report having no adverse effects at all.

Photo by Ron Pastorino, Yellow Stainer mushroom

How to tell a Field Mushroom from a Yellow Stainer

Field mushrooms and Yellow Stainers can look similar to an untrained eye. However there are a few ways you can tell them apart.

Colour – The flesh of a Yellow Stainer will go a strong yellow colour if squeezed. Field mushrooms may sometimes bruise with a slight yellowing, but not as vivid as the Yellow Stainer. If cooked, Yellow Stainers will also turn yellow, so discard!

Ringzone – Mushrooms have a ‘ringzone’ along the stem, which is a band of tissue that is left after the head of the mushroom blooms out and reveals the gills. The ringzone in a field mushroom is small, whereas it is much more pronounced on the Yellow Stainer. It can clearly be seen in the photo above.

Stalk – If you cut through the base of a Yellow Stainer stalk, there will be a distinct yellow colour. The stalk of a Yellow Stainer is also more bulbous at the base than a Field Mushroom.

Photo By frankenstoen, Yellow Stainer

Gills – young Yellow Stainers have white gills before they mature to pink. To be able to correctly identify mushrooms, it’s best to wait until the gills are revealed.

Smell – Field mushrooms smell nice, with a mushroomy scent we are all familiar with. Yellow Stainers have sweet, medical kind of smell to them, like mothballs.

Remember… foraging for field mushrooms is fun, but make sure you have the correct identification before eating to be safe. Also, make sure you pick from a clean area that’s not polluted with fumes, or dog wee! Your average field should be fine, but avoid picking along footpaths.

What is the Best Way to Gather Field Mushrooms?

Once you have found a field mushroom, you can simply grasp it by the stalk and pull. Or, you could use pocket knife to slice it off close to ground level. I often discard the stalk anyway as they can contain small worms.

You can put mushrooms in a bag, but this may cause then to break, especially if you have several. Wicker baskets for mushrooms are ideal, as you can space them out and keep the air circulating around them.

While carrying a wicker basket might be a little cumbersome if out on a walk, they are good if you already know where mushrooms are growing and want to pop out to get some. Alternatively, if you don’t find mushrooms, you could use a basket to gather other autumn wild fruits you see along the way, such as blackberries. Read more about wild edibles in our foraging guides.

Can I Store Field Mushrooms?

Field mushrooms are best eaten fresh, but will last a day or so in a fridge. If you want to store them for longer, I recommend drying.

How to Dry Field Mushrooms

I really enjoy adding dried field mushrooms to dishes. I think drying them gives them a smokier flavour that adds a great base note to any sauce dish, such as casseroles and bolognaise.

To dry, simply peel off the outer skin and cut into small pieces. Arrange on a baking tray and put in a warm oven, leaving the door open to let the moisture out. Check regularly.

When the mushroom pieces feel crisp, put them into a dry jar and secure with a lid. This way, you can just use them when you want and they will last for months!

So next time you go out walking and see a field mushroom… pick it, identify it, and enjoy!

More on Safe Mushroom Identification

If looking for edible mushrooms, it’s a good idea to have a way to identify what you are picking while out in the field.

This Collins Gem mushrooms book will easily fit in your pocket when out walking, and will help you learn more about funghi.

If you are interested in other types of foraging, Richard Mabey’s Food for Free is another excellent book.

This version is also pocket sizes, so easy to carry out with you on walks.

What are your best tips for foraging for mushrooms? Please share!

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