Poplar knight: how to spot this autumn mushroom of poplars

Few people know the poplar knight, and that's a shame. It grows where nobody looks for other mushrooms — under poplars in parks, shelterbelts and along roadsides — and often turns up in huge clusters. For anyone who knows its features, it's a reliable late-fall haul.

Let's look at how to recognize the poplar knight, where and when to look for it, and how to cook it properly.

What the poplar knight looks like

• Cap 6–12 cm, reddish brown or clay brown, slimy and shiny in wet weather, with an inrolled margin; often covered with stuck-on bits of soil.
• Gills whitish, turning brownish or pinkish with age, often with rusty spots.
• Stem whitish, browning toward the base, firm.
• Flesh white, with a mealy smell and taste.

Where and when it grows

The key clue is poplars. The poplar knight forms mycorrhiza with poplars, so look for it under them: in parks, shelterbelts, roadside plantings, on sandy soils. It grows in large troops and clusters, often half-buried in the soil and fallen leaves.

The season runs from the second half of September through November, until the first hard frosts. It's a typical late-fall mushroom, appearing when the forest's selection is already narrowing.

Is it edible, and how to cook it

The poplar knight is conditionally edible: it must be boiled first, with the water discarded, and only then fried or pickled. It isn't eaten fresh — it can cause stomach upset. Young, firm mushrooms taste better than old ones.

Since this mushroom is often covered in sand and soil, it's thoroughly washed and cleaned before cooking.

What to keep in mind

• Only under poplars. If there are no poplars nearby, it's not a poplar knight.
• Wash thoroughly. The slimy cap collects lots of sand and dirt.
• Don't confuse it with the grey knight — the grey knight's cap is gray and dry, while this one's is reddish brown and slimy. Read about other types of knights in our guide.
• Avoid the edges of busy roads — mushrooms accumulate pollutants.

Sources

• “Key to the Fungi of Ukraine” (Kyiv, Naukova Dumka publishing house).
• Tricholoma populinum on GBIF, the global biodiversity database.
• Tricholoma populinum on MycoBank, the international fungal nomenclature database.
• Tricholoma populinum on Wikipedia.