What You Should Know
Tricholoma scalpturatum is a species of agaric fungus in the family Tricholomataceae. Found in Europe, it grows in a mycorrhizal association with deciduous trees including Quercus, Fagus, Tilia, and Populus, and occasionally with Pinus.
The cap is conical initially, flattening to a convex shape. Measuring 4 to 8 cm in diameter, it is covered with scales, it is paler than many other tricholomas, and has crowded white or pale grey gills which often slowly stain lemon yellow when bruised.
Other names: Yellowing Knight.
Tricholoma scalpturatum Mushroom Identification
4 to 8 cm in diameter when fully mature, the caps are usually grey, darker in the center and with paler margins that tend to become yellowish with age. The gray-brown fibrous surface scales are progressively denser and darker (sometimes almost black) towards the center of the cap. Caps are broadly convex, generally retaining a downturned margin and a very shallow umbo.
Moderately well spaced apart, the gills are adnate to emarginate, broad, white at first, yellowing with age.
Typically 10 to 20mm in diameter and 4 to 8cm long, more or less cylindrical, the stem is white or pale grey and finely fibrous, often with a faint cortina-like ring zone created by a fleeting veil. The stem yellows slightly with age.
A cutis made up of hyphal elements mostly 15-45 x 3-8μm.
Ellipsoidal, smooth, 4-6 x 3-4μm, with a hilar appendage; inamyloid.
Odor and Taste
Mealy taste and odor, becoming unpleasantly rancid when old.
Habitat & Ecological Role
Mycorrhizal, in broad-leaf woodland, mainly with Beech, limes and oaks; occasionally in pine woodland.
Tricholoma sciodes is usually greyer in appearance, often with a violet tinge to its cap surface, and its gill edges develop black speckles; it occurs in oak woodland; its spores are much broader than those of Tricholoma scalpturatum.
Tricholoma scalpturatum Taxonomy and Etymology
When Elias Magnus Fries described this mushroom scientifically in 1838 he established it basionym, giving it the name Agaricus scalpturatus. (In the early days of fungus taxonomy, most of the gilled mushrooms were included initially in the genus Agaricus, but the vast majority have since been relocated in other newer genera to leave on the 'true mushroom' in a more manageable Agaricus genus.) It was French mycologist Lucien Quelet who in an 1872 publication established the currently-accepted scientific name as Tricholoma scalpturatum.
The generic name Tricholoma means 'with hairs on the edge', which is true of only a minority of species in this genus. The specific epithet scalpturatum means scratched or engraved - a reference to the scales on the surface of the cap of this mushroom.
Tricholoma scalpturatum Synonyms
Agaricus chrysites Jungh. (1830)
Agaricus scalpturatus Fr. (1838)
Gyrophila argyracea var. chrysites (Jungh.) Quél. (1886)
Tricholoma argyraceum subsp. chrysites (Jungh.) Sacc. (1887)
Tricholoma argyraceum var. chrysites (Jungh.) Gillet (1874)
Tricholoma chrysites (Jungh.) Quél.
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