Tricholoma sejunctum

Deceiving Knight

A yellowish to olive-yellow Tricholoma with dark radiating fibers on the cap center, white gills and a strong mealy odor. It was described from England. North American use of the name has been very broad. MushroomExpert restricts it to hardwood-associated, greenish-yellow collections and doubts that these match the European species.

Species profile

Edibility: Toxic
Not edible; possibly toxic. Edibility is disputed: some field guides list it as edible, others say the taste is nauseating, and it is described as unsafe because it is hard to identify with certainty. European poisonings are mentioned without a verifiable source. Yellow-green Tricholomas are also easily confused with each other, and greenish-yellow caps occur in the deadly death cap (Amanita phalloides); check for a volva and ring. Do not eat.

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Mycology is an evolving science: names, classifications and safety information change as research advances. Entries are compiled from cited sources and reviewed, but may be incomplete or out of date — check the sources, and never rely on this library alone to identify or eat a mushroom.

Habitat

Ectomycorrhizal. In Europe mainly with oaks and birches, occasionally under pines (First Nature); MushroomExpert describes North American collections with oaks and other hardwoods; MykoWeb reports California material in coniferous or mixed forests. Scattered or gregarious, late summer and fall (into winter on the Pacific coast).

Distribution

Described from Europe; reported across much of the Northern Hemisphere. North American records come from the Northwest coast and the East (MushroomExpert describes collections from Illinois, Kentucky, Michigan and Missouri), but MushroomExpert calls the North American distribution uncertain, and North American material may not be the European species.

Characteristics

Cap: 4-9 cm, convex with a central bump to nearly flat; yellowish to olive-yellow with grayish to olive radiating fibers, densest at the center. Gills: notched, close, white, sometimes yellow-stained near the margin. Stem: 3-10 cm x 1-1.5 cm, whitish, sometimes tinged yellow. Flesh: white, unchanging. Odor and taste: mealy (farinaceous). Spore print: white. Spores: 5-8 x 3.5-5.5 um, ellipsoid, smooth, inamyloid (MushroomExpert).