Mushrooms with a ring on the stem: what it warns you about

The ring, or skirt, on a mushroom's stem is one of the most important features every forager has to learn to read. It shows up on very different mushrooms: on the tasty honey fungus and on the deadly death cap. So a ring on its own decides nothing, but together with other details it becomes the key to identification and to safety.

Let's look at where the ring comes from, which mushrooms have one and when it turns into a danger signal.

Where the ring comes from

While the mushroom is young, its gills are covered from below by a thin veil that protects the ripening spores.

As the mushroom grows and the cap opens, this veil tears. What's left of it stays on the stem as a ring or skirt. So the ring is a trace of the mushroom's youth that remains on the mature mushroom too.

The ring varies from mushroom to mushroom: thick and wide, thin and membranous, movable or fixed. Sometimes all that's left of it is a faint band or traces, so you need to look carefully.

Which mushrooms have a ring

A ring appears both on excellent edible mushrooms and on deadly poisonous ones.

• **Honey fungus.** Has a white membranous ring, the main feature that sets it apart from the poisonous ringless false honey fungi.
• **Parasol mushroom.** Has a wide, movable ring that you can slide freely along the stem.
• **Agaricus.** Also has a ring on the stem, along with pink and later dark gills.
• **Death cap and amanitas.** Have a skirt, but along with it, a sac at the base.

As you can see, a ring by itself doesn't tell you whether a mushroom is good or dangerous. What decides it is what comes with it.

When a ring is a danger signal

The most important rule is about the combination of features.

If the stem has a ring-skirt, and at the base there's a sac or a noticeable swelling with a rim, you're most likely looking at an amanita, possibly even the deadly death cap. This exact combination, skirt plus sac, is the main danger signal in the whole mushroom world.

So whenever you see a ring, always dig the mushroom up carefully and look at the base of the stem. No sac is a point in favor of an edible mushroom (honey fungus, parasol, Agaricus). A sac means the mushroom stays in the forest. More about the most dangerous mushroom of this kind in the article on the death cap.

How to read a ring correctly

A few steps will help you avoid mistakes.

1. Check whether there's a ring. If a mushroom that looks like honey fungus has none, that's a reason to be on your guard.
2. Look at the base of the stem. Dig up the whole mushroom to see whether there's a sac.
3. Check whether the ring moves. On a parasol it slides freely; on amanitas it's fixed.
4. Consider the gills. White gills together with a skirt are a warning sign.

More mushrooms with a skirt in the collection by ring, and the full safety guide in the rules for safe foraging.

Sources

• “Key to the Fungi of Ukraine” (Kyiv, Naukova Dumka publishing house).
• Amanita phalloides in GBIF, the global biodiversity database.
• Annulus (mycology) in MycoBank, the international nomenclature database for fungi.
• Annulus (mycology) on Wikipedia).