Pored vs. gilled mushrooms: what's the difference?

The first thing an experienced forager does with an unfamiliar mushroom is turn the cap over and look underneath. That's where the key identification feature hides: the hymenophore — the layer where spores mature. In most mushrooms it comes in one of two types: pored (tubes) or gilled. Learning to tell them apart is the basic skill that safe foraging starts with.

Let's look at the difference and why it matters so much.

What is a hymenophore

The hymenophore is the underside of the cap that “sows” spores. To increase its area and spread as many spores as possible, nature made it folded rather than smooth. The two main versions of this “folding” gave us two big groups of mushrooms.

Pored mushrooms (boletes)

In pored mushrooms, the underside of the cap is made of countless tiny tubes that look like a sponge or honeycomb with tiny pores.

• What it looks like: a porous, spongy surface; the tubes separate easily from the cap flesh.
• Examples: porcini, slippery jack, brown birch bolete, red-capped scaber stalk, Xerocomus boletes, bovine bolete, bay bolete — the whole “noble” bolete family.
• Good news for beginners: in Ukraine there are almost no deadly poisonous species among pored mushrooms. The dangerous exceptions are the bitter bolete (Tylopilus felleus) and the devil's bolete, but they aren't deadly. That's why boletes are considered a safer group for a beginner.

Gilled mushrooms

In gilled mushrooms, the underside of the cap is formed by thin radial gills (like spokes in a wheel) running from the stem to the edge.

• What it looks like: even, blade-like plates arranged like rays.
• Examples: brittlegill, Agaricus, honey fungus, Tricholoma (knights), oyster mushroom, yellow knight — and, sadly, the most dangerous mushrooms too.
• Careful: it's among gilled mushrooms that the deadly death cap, amanitas and poisonous Agaricus lookalikes hide. So gilled mushrooms call for extra care when identifying.

A special case: false gills

Some mushrooms look gilled underneath, but what you're actually seeing are ridges — thick, forked, running far down the stem. The classic example is the chanterelle. Its “gills” don't come away and merge into the stem. This feature saves you from the false chanterelle. We've written separately about chanterelle lookalikes — the true and the false.

Why it's the first thing to check

The hymenophore type instantly cuts your search in half. See a sponge under the cap — it's a bolete, and you immediately rule out all gilled species, including the death cap and its kin. See gills — it's time to be especially careful and check the species thoroughly.

But the hymenophore type alone is no guarantee of edibility. It's only the first filter. Next you check the color, how the cut flesh changes, the smell, the stem, the ring and the base. Never eat a mushroom unless you're 100% sure of its identification.

Sources

• “Identification Guide to the Fungi of Ukraine” (Kyiv, Naukova Dumka publishing house).
• Hymenophore on Wikipedia.
• Boletales and Agaricales in GBIF, the global biodiversity database.