Curious about the Boletus edulis mushroom, also known as the penny bun, cep or porcini?
You’re in for a treat!
This post will show you how to spot this delicious wild mushroom, when and where to find it in the UK, and what makes it such a favourite for foragers and chefs alike.
We’ll also cover lots of special tips on how to cook it, preserve it, and avoid any lookalikes.
If you’ve been meaning to get to know the Boletus edulis mushroom better, this one’s for you.
Names and meaning
Scientific name: Boletus edulis
The genus name Boletus comes from the Greek word bolos, meaning “lump of clay”—likely referring to the mushroom’s stout, chunky shape.
The species name edulis is Latin for “edible” – and rightly so, as this mushroom has earned a reputation as one of the tastiest wild mushrooms in the world.
Common names around the world
This mushroom is beloved across Europe and goes by many local names:
Porcini in Italy – meaning “little pigs”, possibly referring to the mushroom’s plump shape or how enthusiastically people hunt for them.
Cèpe in France – derived from cep, meaning “trunk” or “log”, referencing the thick, sturdy stem.
Steinpilz in Germany – literally “stone mushroom”, perhaps due to its firm texture.
Eekhoorntjesbrood in Dutch – charmingly translates as “squirrel’s bread”.
Distribution: where Boletus edulis grows
Boletus edulis is fairly common across Britain, Ireland, and much of Europe, Asia, and North America.
A well-known variety in North America is the California king bolete (B. edulis var. grandedulis), a darker, larger type identified in 2007.
Boletus edulis mushrooms vary in colour and size by region, and researchers believe they may form a “complex” or group of closely related species.
Though native to the Northern Hemisphere, Boletus edulis has been introduced to southern Africa, Australia, New Zealand, and Brazil, where it now grows in suitable forest habitats.
Boletus edulis medicinal benefits
Porcini mushroom benefits: these mushrooms aren’t just delicious—they’re also packed with nutrients and health-supporting compounds.
Here’s a quick look at some of their potential medicinal uses:
Rich in nutrients
Low in calories and fat, but high in fibre, vitamins, and minerals, porcini offer a nutritious boost to any meal.
Antioxidant power
Boletus edulis mushrooms contain natural antioxidants like vitamin E, beta carotene, and polyphenols1. These compounds help neutralise harmful free radicals, protecting your cells and lowering the risk of chronic disease.
May help fight cancer
Early research suggests that Boletus edulis extracts can slow the growth of breast cancer cells2. Their antioxidant content may help prevent healthy cells from turning cancerous.
Supports digestion
Thanks to their high fibre content, Boletus edulis mushrooms can promote a healthy gut and help prevent constipation.
Liver protection
Studies show that Boletus edulis’s antioxidants may help reduce inflammation and protect liver cells from damage1—especially in cases of alcohol-related liver stress.
Natural antimicrobial properties
Boletus edulis mushrooms contain compounds with antibacterial and antiviral effects, which may help the body fight off infections, including some drug-resistant bacteria1.
Heart health and blood pressure
Their low sodium and high potassium content support healthy blood pressure. Combined with their fibre and antioxidants, Boletus edulis mushrooms may also reduce inflammation and benefit your heart health.
Key identifiers of Boletus edulis
Porcini mushrooms are easy to spot once you know what to look for. They often grow under broad-leaved or coniferous trees, either alone or in small groups.
Young specimens are especially distinctive with their thick stems and small, bun-like caps.
Cap
Size: 7–25 cm wide
Colour: White when young, turning crusty brown like a bread roll (hence the name “penny bun”)
Edge: Often pale or white
Texture: Dimpled, sometimes slug-damaged, revealing white flesh underneath
Pores (not gills)
White when young, then fade to yellow and finally green as they age
Spongy texture underneath the cap
No gills present
Stem (stipe)
10–14 cm long, 2–4 cm thick
Sturdy and bulbous, starting off white, ageing to tan or pale yellow
Covered with a fine white net-like mesh (reticulation), especially near the top
Solid and firm, often maggot-free when young and fresh
Flesh
White, slightly yellowing with age
Firm and thick throughout
Spore print
Greenish-brown, subfusiform in shape
Taste & smell
Excellent flavour, rich and nutty
Delicious raw or fried in butter
One of the best mushrooms to dry, as the flavour intensifies beautifully
Boletus edulis lookalikes
Boletus edulis is one of the safest wild mushrooms you can forage. That’s because very few poisonous species resemble it closely, and even those that might appear similar at first glance are actually quite easy to tell apart if you know what to look for.
Let’s break down a few lookalikes and how to spot the difference.
The bitter bolete (Tylopilus felleus5)
This is probably the most common impostor. It’s not poisonous, but it’s incredibly bitter—so much so that even a small piece can ruin an entire dish. Luckily, there are a few good ways to tell it apart from porcini:
Taste test: A tiny nibble of raw flesh will quickly give it away—porcini are mild and nutty, while the bitter bolete lives up to its name.
Pore colour: Porcini have whitish pores underneath the cap, while the bitter bolete’s pores are pinkish.
Stem pattern: Porcini stems show a light, white net-like pattern (called reticulation) on a darker brown background. In contrast, the bitter bolete has a darker net on a paler stem.
The devil’s bolete (Rubroboletus satanas6)
This one is poisonous, but it’s pretty easy to avoid. It looks dramatic, and that’s your first clue:
Red stem: Unlike porcini’s brownish stem, the devil’s bolete has a vivid red one.
Blue bruising: When you cut or bruise it, the flesh quickly turns blue—a classic sign of toxicity in boletes.
Location and rarity: It’s not common, especially in cooler climates, and it often grows in warmer parts of southern Europe.
So, while it shares a similar chunky shape, its colouring is wildly different.
The summer bolete (Boletus reticulatus7)
This one is a close cousin to the porcini and is edible and delicious too. The differences are subtle:
Season: It shows up earlier in the year, typically in early summer.
Stem: Slightly darker and less dense than porcini.
Cap edge: It lacks the pale white margin around the cap that B. edulis often has.
They’re close enough that many people consider them interchangeable in the kitchen.
Habitat & ecology
Porcini mushrooms thrive in mixed woodland, especially near beech, oak, and pine. They’re often found at the edges of clearings, growing singly or in small groups.
Like all common UK boletes, Boletus edulis is ectomycorrhizal—it forms a mutual partnership with tree roots, helping trees absorb nutrients while receiving sugars in return.
🌳 These fungi can’t survive without trees, so you won’t find them in open grassland. Even though they may appear some distance from the tree, they’re always connected underground.
Sustainability
Boletus edulis mushrooms are fairly common in the wild if you know where to look.
According to the IUCN, Boletus edulis is listed as Least Concern (LC) with a stable global population8.
✅ As long as you forage responsibly—leave some behind and avoid damaging the habitat—porcini picking remains a sustainable activity.
When to harvest
The Boletus edulis mushroom can appear as early as June or July, but the main season runs from August to October, sometimes into November if conditions stay mild.
The best time to pick is a few days after summer rain, when young, firm fruitbodies are at their peak.
⏳ Wait a week or more and many will be maggot-ridden, especially if the pores have turned greenish-yellow—a sure sign it’s past its prime.
Culinary notes
Aside from truffles, Boletus edulis mushrooms are among the most prized wild mushrooms in Europe.
Some foragers seek only these—such is their reputation for flavour and texture.
Flavour & texture: Rich, nutty, slightly meaty, with a creamy mouthfeel and sourdough-like aroma.
Cooking tips:
Fresh: Sauté in olive oil or butter until golden. Delicious with pasta, risotto, or potatoes.
Dried: Even more flavourful—intensely umami. Rehydrate in warm water, then cook with the soaking liquid for full depth.
French style: Partially dry in the oven, collect and store in their own juices, then pan-fry later.
Preserving: Freeze well. Also good pickled or even raw in thin slices.
Pro tip: Drying boosts natural glutamates, enhancing their savoury punch—ideal for soups and stocks.
How to dry and store Boletus edulis
Drying is the best way to preserve the intense flavour of ceps.
Drying:
Slice thinly (5 mm or so) for even drying.
Use a dehydrator or oven set to 40–50°C (with the door slightly ajar).
Dry until crisp—no sponginess should remain.
Alternatively, thread slices onto string and hang in a dry, airy place.
Storing:
Once fully dry, store in airtight jars away from light and moisture.
Keeps for over a year if properly dried.
To use:
Soak in warm water for 20–30 minutes.
Use the soaking liquid in sauces, soups or risottos for an extra flavour kick.
1. Porcini risotto
Start by soaking dried porcini in warm water for 30 minutes, then strain and reserve the soaking liquid. Sauté finely chopped onions in olive oil until soft, then add Arborio rice and toast it lightly. Gradually add the porcini soaking liquid and some vegetable stock, stirring continuously until the rice is creamy and cooked. Fold in the soaked porcini pieces, a knob of vegan butter or parmesan, and season with salt and pepper. Serve warm with fresh wild greens such as wood sorrel.
2. Sautéed fresh porcini with garlic and thyme
Clean fresh porcini mushrooms carefully and slice thickly. Heat olive oil or vegan butter in a pan, then add minced garlic and fresh thyme leaves. Toss in the porcini slices and sauté on medium heat until golden brown and tender. Season with salt and black pepper. This simple side dish pairs wonderfully with roasted vegetables or crusty bread.
3. Porcini mushroom soup
Sauté chopped onions, carrots, and celery in olive oil until soft. Add chopped fresh or rehydrated dried porcini mushrooms and cook for a few minutes. Pour in vegetable stock and simmer for 20 minutes. Blend half the soup until smooth and return to the pot, giving the soup a creamy texture without cream. Season with salt, pepper, and serve garnished with fresh chives.
4. Porcini mushroom pasta
Cook your favourite pasta until al dente. In a separate pan, sauté sliced porcini mushrooms in olive oil with garlic and a pinch of chilli flakes. Add a splash of white wine and let it reduce, then stir in some chopped fresh parsley. Toss the pasta through the mushroom sauce and finish with a drizzle of good-quality olive oil. Optionally sprinkle with vegan parmesan for an extra umami hit.
5. Porcini mushroom and barley stew
In a large pot, sauté onions, garlic, and diced carrots until soft. Add chopped fresh or dried porcini mushrooms, rinsed pearl barley, and vegetable stock. Simmer gently for 45 minutes until the barley is tender and the stew has thickened. Season with salt, pepper, and a sprig of rosemary. This hearty stew is perfect for cooler days and can be served with crusty bread for a filling meal.
How to grow Boletus edulis
Growing Boletus edulis (penny bun, cep, porcini) at home is notoriously difficult.
That’s because it forms a special relationship with trees—called mycorrhiza—which is hard to replicate artificially. Unlike mushrooms that grow on compost or logs, B. edulis relies on living tree roots to thrive.
Even though it’s sold commercially, most porcini on the market are foraged, not farmed.
Attempts to cultivate Boletus edulis have mostly failed, likely because certain soil microbes—still not fully understood—are needed for it to bond properly with its host tree.
In short: if you want to “grow” porcini, the best method is to protect and observe natural woodland areas where it already thrives.
Other uses of Boletus edulis
Its sponge-like pores can be dried and used to dye yarn, producing beautifully rich, earthy tones.
With an alum mordant, expect a buttery yellow, while an iron mordant gives a medium tan.
And the best part? The yarn retains the earthy, savoury scent of the mushroom—rich and unmistakably wild.
Boletus edulis fun facts
🍄 Tests on commercially available dried Boletus edulis mushrooms showed that packets often contain many different Bolete mushrooms, as they’re hard to tell apart once dried. Some packs contained not a single Boletus edulis9!
🍄 Some folklore says the best time to hunt for penny buns and other ceps is during a full moon10, while an Italian tradition states that this is when baby Boletus edulis start growing11.
🍄 Each mushroom can weigh up to a kilo when fully grown—but a giant Boletus edulis found on the Isle of Skye in 1995 weighed an incredible 3.2 kg! Its cap measured 42 cm across, with a stout stem 18 cm tall and 14 cm wide12.
References
- Health Benefits of Bolete Mushroom by WebMD ↩︎
- Biological Properties of Boletus edulis Extract on Caco-2 Cells: Antioxidant, Anticancer, and Anti-Inflammatory Effects by NIH ↩︎
- Health Benefits of Bolete Mushroom by WebMD ↩︎
- Health Benefits of Bolete Mushroom by WebMD ↩︎
- Tylopilus felleus by First Nature ↩︎
- Devil’s Bolete by Wild Food UK ↩︎
- Summer Bolete Boletus reticulatus by iNaturalist ↩︎
Share your experiences
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Share your thoughts or questions in the comments below—I’d love to hear from you!
