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  • Writer's pictureThe Wild Foodie

Field Mushrooms: Identification and Look-alikes

Updated: Sep 9, 2023

Field mushrooms (Agaricus campestris) are a delightful and flavoursome variety of mushrooms that can be found in abundance throughout the UK. Known for their delicious taste and versatility in recipes, field mushrooms have been a popular choice for mushroom enthusiasts and foragers alike. In this post, we will delve into the identification characteristics of field mushrooms and explore some of the best locations in the UK to find them.

Field Mushroom
Field Mushroom

Identification of Field Mushrooms

The field mushroom, is a familiar and widely encountered mushroom species in the UK. Its presence is most notable during the late summer and early autumn months when it emerges in various grassy habitats, including meadows, pastures, and open fields. This mushroom has distinct characteristics that make it easily recognisable.

The field mushroom's appearance is a defining feature. Initially, its cap is somewhat hemispherical, but as it matures, it flattens out, often reaching a diameter of 10cm or more. The cap is typically creamy white, sometimes adorned with brownish scales, particularly towards its centre. Beneath the cap, one can observe closely spaced gills that start out pink and gradually turn dark brown as the mushroom ages. The stem is cylindrical, solid, and white, often featuring a slight swelling at its base.

Field Mushroom Identification checklist:

Field Mushrooms
Field Mushrooms

Cap: The cap of a field mushroom is typically white or cream-coloured, measuring between 5 and 10cm in diameter. It starts out rounded and gradually expands, often developing a slightly flattened shape as it matures.

Gills: Underneath the cap, field mushrooms possess closely spaced, free gills that are initially pink, turning dark brown as they mature.

Stem: The stem of a field mushroom is cylindrical, firm, and often white in colour. It is usually thicker at the base and tapers towards the top.

Ring: Look for a fragile, movable ring around the upper part of the stem. This ring is a remnant of the partial veil that protected the mushroom's gills when it was developing.

Spore Print: To obtain a spore print, place the cap of a mature field mushroom on a sheet of white paper overnight. The resulting spore print should be dark brown.

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Where to Find Field Mushrooms in the UK

Field mushrooms can be found in various habitats across the UK, typically appearing in late summer and autumn, including:

Meadows and Pastures: Field mushrooms have a preference for open grasslands, meadows, pastures and fields, hence the name. Look for them in fields that are not heavily grazed or treated with chemicals.

Woodland Edges: Often, field mushrooms can be found at the edges of woodlands, where the grass meets the trees. These areas offer the right balance of sunlight and shade that supports their growth.

Parks and Gardens: In urban areas, parks and well-maintained gardens can also be fruitful hunting grounds for field mushrooms. Check out areas with well-watered lawns.

Farms: Some farms may allow foraging, so it's worth checking with local farmers for permissions. Fields that are used for livestock grazing, particularly with cattle or horses, may yield good results.

When are Field Mushrooms in season?

The field mushroom season in the UK typically occurs from late summer to autumn, usually starting in August and extending through October. However, the exact timing can vary depending on weather conditions and geographical location. Field mushrooms thrive in mild and damp conditions, often appearing after periods of rainfall. It's important to note that mushroom fruiting can be unpredictable, and their availability may vary from year to year. But once you have found a patch, they are likely to appear there or in the vicinity year after year.

You might also be interested in our our guide on foraging wild mushrooms.

Are Field Mushrooms OK to eat?

Yes, field mushrooms are generally safe to eat and enjoyed by many. However, it's important to exercise caution when foraging for mushrooms and follow proper identification practices. Always ensure you 100% correctly identify field mushrooms by familiarising yourself with their distinguishing features, consult a reputable field guide and if you are new to foraging seek guidance from an experienced mycologist or foraging group.

Safety Considerations

While field mushrooms are generally safe to consume, it's crucial to exercise caution and adhere to proper foraging practices. Keep the following points in mind:

  • When in doubt, consult a reputable field guide or seek guidance from an experienced mushroom forager before consuming any wild mushroom.

  • Learn from others, join foraging groups, glean information in the field from experienced people.

  • Never eat anything unless it is 100% confirmed as the edible species that you are looking for.

Field Mushroom Look-alikes

While field mushrooms are generally safe to eat, it's crucial to be aware of their look-alikes, some of which may be toxic or inedible. Here are a few common mushrooms that can resemble field mushrooms:

Horse Mushroom (Agaricus arvensis): Horse mushrooms closely resemble field mushrooms and share many similar characteristics. They have a white or cream-coloured cap that can grow quite large, often reaching 10 to 20cm in diameter. The gills of the horse mushroom start off pink and eventually turn dark brown as they mature. The stem is sturdy, white, and often has a ring. Horse mushrooms are edible and prized for their culinary value. They have a mild, pleasant taste and a meaty texture, making them a popular choice for cooking.

Toxic: Yellow Stainer Mushroom
Toxic: Yellow Stainer Mushroom

Yellow Stainer (Agaricus xanthodermus): This mushroom closely resembles the field mushroom in appearance but has a distinctive yellow staining reaction when bruised or cut. It has a strong phenol-like odour and can cause gastrointestinal distress if consumed.

False Death Cap (Amanita citrina): The False Death Cap resembles the field mushroom when it's in its younger stage. It has a pale yellow or cream-coloured cap and white gills, but it lacks the distinctive ring on the stem. It is toxic and can cause severe gastrointestinal symptoms.

Toxic: False Death Cap
Toxic: False Death Cap

The Blusher
The Blusher

The Blusher (Amanita rubescens): This mushroom has a pinkish-brown cap and white gills, similar to the field mushroom. However, it features a distinctive ring on the stem. The Blusher can be consumed safely when cooked, but it is known to cause mild digestive issues in some individuals.

Inky Caps (Coprinus species): Certain inky cap mushrooms may resemble field mushrooms, particularly when they are young and have white caps. However, inky caps have gills that eventually turn black and liquefy, giving them their name. Some inky caps are edible when consumed before the gills blacken, but caution is advised due to potential confusion with toxic species.

These are just a few examples of mushrooms that resemble field mushrooms. It's important to consult a reliable field guide or seek expert advice from a mycologist to accurately identify any mushrooms you encounter before consuming them. Remember, it's always better to err on the side of caution when it comes to foraging for mushrooms.

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Cooking Field Mushrooms

Cooking field mushrooms can enhance their flavour and texture, making them a delicious addition to various dishes. Here are a few popular cooking methods for field mushrooms:

Frying: Frying field mushrooms is a simple and versatile method. Start by cleaning the mushrooms and removing any dirt or debris. Slice them into desired thickness. Heat a frying pan over medium-high heat and add a bit of oil or butter. Once hot, add the mushrooms and fry them for about 5-7 minutes, stirring occasionally. Season with salt, pepper, and herbs of your choice (thyme is our favourite). Fried field mushrooms make a tasty side dish, or they can be used as a topping for steaks, burgers, or salads.

Grilling: Grilling field mushrooms can add a smoky and charred flavour to their natural taste. Preheat the grill to medium-high heat. Clean the mushrooms and remove the stems if desired. Brush them with olive oil or marinade them with herbs and spices. Place the mushrooms on the grill and cook for about 4-6 minutes on each side until tender and lightly charred. Grilled field mushrooms are great for burgers, sandwiches, or served as a side dish.

Roasting: Roasting field mushrooms can intensify their flavour and create a rich, earthy taste. Preheat the oven to around 200°C (400°F). Clean and trim the mushrooms if needed, and place them on a baking sheet. Drizzle with olive oil and season with salt, pepper, and herbs such as thyme or rosemary. Roast the mushrooms in the oven for about 15-20 minutes until they are tender and golden brown. Roasted field mushrooms work well in pasta dishes, risottos, or as a side to roasted meats.

Stuffing: Field mushrooms can be stuffed with a variety of delicious fillings. Clean the mushrooms and remove the stems. Prepare a filling of your choice, such as a mixture of breadcrumbs, herbs, cheese, and fried vegetables. Stuff the filling into the mushroom caps, place them on a baking sheet, and bake in a preheated oven at around 180°C (350°F) for about 15-20 minutes until the filling is golden and the mushrooms are tender. Stuffed field mushrooms make a delightful starter or a vegetarian main course option.

Remember, when cooking mushrooms, it's important to avoid overcooking them to preserve their texture and flavour.

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Field Mushroom Recipes

From velvety mushroom soup to hearty mushroom and leek tarts, these dishes are a testament to the culinary prowess of this native ingredient, literally from filed to fork.

Creamy Field Mushroom Soup

  • Gently fry chopped field mushrooms with onions and garlic in butter until they're soft and golden.

  • Add vegetable or chicken stock and simmer until the mushrooms are tender.

  • Use a hand blender to puree the soup until smooth.

  • Stir in cream or coconut milk for a rich, creamy texture.

  • Season with salt, pepper, and fresh herbs like thyme or parsley.

Field Mushroom Risotto

  • Fry sliced field mushrooms with shallots and garlic in olive oil.

  • Add Arborio rice and cook until it's lightly toasted.

  • Gradually add vegetable or chicken stock, stirring constantly until the rice is creamy and tender.

  • Finish with grated Parmesan cheese, fresh herbs, and a drizzle of truffle oil if desired.

Stuffed Field Mushrooms

  • Remove the stalks from field mushrooms and hollow out the caps.

  • Prepare a stuffing mixture with breadcrumbs, grated cheese, garlic, herbs, and chopped mushroom stalks.

  • Stuff the mushroom caps with the mixture.

  • Bake in the oven until the mushrooms are tender and the stuffing is golden brown.

Mushroom and Spinach Omelette

  • Fry sliced field mushrooms with spinach until they're cooked and any liquid has evaporated.

  • Whisk eggs with a little milk, salt, and pepper.

  • Pour the egg mixture into a hot, greased pan and add the cooked mushrooms and spinach.

  • Cook until the omelette is set, fold it in half, and serve.

Mushroom and Garlic Pasta

  • Fry sliced field mushrooms with minced garlic in olive oil until they're golden brown and fragrant.

  • Toss the cooked mushrooms with your favourite pasta and a drizzle of olive oil.

  • Add freshly grated Parmesan cheese and chopped parsley before serving.

Grilled Mushroom Skewers

  • Marinate whole field mushrooms in a mixture of olive oil, balsamic vinegar, garlic, and herbs.

  • Thread the marinated mushrooms onto skewers and grill until they're charred and tender.

  • Serve as a side dish or on top of salads.

Mushroom and Leek Tart

  • Make a savoury tart crust or use store-bought pastry.

  • Sauté sliced leeks and field mushrooms until they're softened.

  • Fill the tart crust with a mixture of the sautéed vegetables, eggs, cream, and cheese.

  • Bake until the tart is golden and set.

Learn how to dry your mushrooms or click the link to see the best Mushroom Dehydrators here.

Summing Up

Field mushrooms (Agaricus campestris) are a delightful and versatile variety of mushrooms that can be enjoyed in various culinary creations. Their distinguishing features, such as the white or cream-coloured cap, closely spaced gills, and cylindrical stem, make them relatively easy to identify. When foraging for field mushrooms, it's important to exercise caution and accurately identify them to avoid any potential risks associated with toxic look-alike species. The UK offers diverse locations, including meadows, woodland edges, parks, and farms, where field mushrooms can be found. Whether fried, grilled, roasted, or stuffed, field mushrooms bring a delightful earthy flavour and a meaty texture to dishes.

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