Birch bolete vs. porcini: how they differ

The brown birch bolete (Leccinum scabrum) and porcini share a family connection: both are pored mushrooms and even belong to the same mushroom “clan.” That's why beginners often confuse them, especially when they see a young birch bolete with pale pores.

In fact, they're easy to tell apart once you know a few features. Let's go through them one by one so you'll never doubt whether you're looking at a brown birch bolete or porcini. For a detailed species comparison, see the page brown birch bolete vs porcini.

The stem, the main difference

The quickest way to tell these mushrooms apart is to look at the stem.

• The brown birch bolete has a long, slender, white stem covered in small dark scales, like pencil strokes.
• The porcini has a thick, barrel-shaped, pale stem with a delicate pale network on its upper part.

Dark scales versus a pale network is the most reliable difference. If the stem has dark streaks, you're looking at a brown birch bolete. If it's thick, barrel-shaped, and has a white network, it's porcini.

Cap and build

The mushrooms' silhouettes differ too, if you look closely.

The brown birch bolete is slender and tall, as if perched on a thin stem. Its cap is proportionally small and gray-brown, and the mushroom itself looks light and elongated.

Porcini is stocky and squat. The stem is thick, the cap massive, from light brown to dark brown, and the whole mushroom looks sturdy and heavy. Next to it, the brown birch bolete is like a ballerina next to a wrestler.

Flesh and cut

If you cut both mushrooms, the difference becomes even more obvious.

• The porcini has white, firm, springy flesh that, when cut, does not change color. That's exactly why it's valued so highly.
• The brown birch bolete has softer flesh that, when cut, often turns slightly gray, and it noticeably darkens during cooking.

It's this unchanging white flesh that gave porcini its Ukrainian name, “white mushroom.” The brown birch bolete gives itself away by darkening, so dishes made with it turn out darker.

Where and when they grow

Both mushrooms occur in similar forests but have different preferences.

The brown birch bolete is loyal to birch and grows mainly in deciduous and mixed birch woods. Porcini is less picky: it lives under oak, pine, beech, and spruce, in deciduous, mixed, and coniferous forests.

Their seasons are almost the same, from summer to autumn. So you can often find a brown birch bolete and porcini side by side in the same birch wood. For when exactly to head out, check our mushroom radar: it shows when moisture and warmth line up well for mushrooms to appear.

Which one tastes better

Porcini is considered the king of the forest: it's firm, aromatic, doesn't darken, and is equally good fried, dried, and pickled. The brown birch bolete is more modest: it's tasty when young, but softer, more watery, and it darkens during cooking.

Still, both mushrooms are wonderful, and finding a brown birch bolete is nothing to be disappointed about. The main thing is not to confuse either of them with the bitter-tasting bitter bolete, which mimics both but stands out with its pinkish pore surface and unbearable bitterness.

Sources

• “Identification Guide to the Fungi of Ukraine” (Kyiv, Naukova Dumka publishing house).
• Leccinum scabrum on GBIF, a global biodiversity database.
• Boletus edulis on MycoBank, the international fungal nomenclature database.
• Leccinum scabrum on Wikipedia.