Tricholoma lookalikes: false and poisonous

Knights (Tricholoma) are a rewarding autumn family, but this is exactly where treacherous lookalikes hide. The tasty grey knight is easy to confuse with the poisonous tiger tricholoma, and among other species there are mushrooms with a soapy or chemical smell that don't belong in your basket either. Knowing these pairs is an autumn forager's best protection.

Let's look at what edible knights get confused with and how to tell them apart from dangerous ones.

Grey knight ↔ tiger tricholoma

The most important pair. The tasty grey knight (Tricholoma terreum) is confused with the poisonous tiger tricholoma.

The tiger tricholoma is large, with distinct dark scales on a gray cap.
The grey knight is smaller, with fine radial fiber streaks and no scales.

Rule: never pick a large gray knight with distinct scales. We cover poisonous knights in a separate article.

Wood blewit ↔ poisonous webcaps

The blewit (wood blewit) can be confused with purple webcaps.

The blewit has even gills and a pleasant smell.
Webcaps have a cobweb-like veil between cap and stem and rusty spores; some of them are poisonous.

If there's a cobweb-like trace on the stem, it's better to leave the mushroom.

Knights with a bad smell

Among the knights there are inedible and poisonous species with a distinctive unpleasant smell:

Soapy knight — with a soapy smell and flesh that turns reddish.
Sulphur knight — yellow, with a smell of gas.

A warning sign is any soapy, gassy or chemical smell.

How to tell an edible knight

Scales: distinct dark scales on a large gray cap are a reason to suspect the tiger tricholoma.
Smell: edible knights smell of flour; a soapy or chemical smell means stop.
Gills: a cobweb-like veil or rusty spores means it's not a knight.
Size and age: pick young species you know well, checking them against our guide to knights.

Sources

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

Frequently asked questions

What poisonous lookalikes do knights have?

The most dangerous is the tiger tricholoma, which resembles the grey knight. There are also the inedible soapy knight and sulphur knight, both with a bad smell.

How do you tell a grey knight from a tiger tricholoma?

The tiger tricholoma is large, with distinct dark scales; the grey knight is smaller, with fine fiber streaks and no scales. Never pick a large gray knight with scales.

What is the wood blewit confused with?

With purple webcaps. The blewit has even gills and a pleasant smell, while webcaps have a cobweb-like veil and rusty spores.

What smell gives away a dangerous knight?

A soapy, gassy or sharp chemical smell. Edible knights smell of flour.

Are Tricholoma lookalikes deadly?

The tiger tricholoma causes severe digestive upset, sometimes with dangerous dehydration. Deaths are rare, but the poisoning is serious.

How do you forage for knights safely?

Pick only species you know, smell your mushrooms, avoid large gray knights with scales and check the gills for a cobweb-like veil.

Can you eat a knight with a soapy smell?

No. A soapy smell is typical of the inedible soapy knight, so a mushroom like that stays in the forest.

What should you do if poisoned by a knight?

Drink plenty to avoid dehydration and seek medical help. It's worth keeping the mushroom leftovers for identification.