Search on : Taxa descriptions

 


   
Literature:
 
Page number:306 
Remarks (public):Tricholoma argyraceum is a pale coloured species, usually with prominent umbo, with rather small fruit-bodies with a short stipe in relation to the diameter of the pileus, and narrow spores. Within this concept is also included Tricholoma inocybeoides A. Pears., which is considered a form with a pileus with a prominent grey-fibrillose umbo (sec below). Tricholoma scalpturatum differs mainly by the darker colours, slightly larger habit, and broader spores. Tricholoma scalpturatum var. atrocinctum Romagn. is considered a form of T. argyraceum with a distinct black line around the stipe. Tricholoma scalpturatum var. argyraceum as depicted in Riva (1998: photo p. 247) represents typical T. argyraceum in our concept, but unfortunately no microscopical details are given for the depicted collection. Also
T inocyboides and T. alboconicum discussed and illustrated in the paper of Riva (I998) fit well in our concept of T argyraceum.
Tricholoma albidum M. Bon has an innately silky fibrillose pileus without squamules. It is probably closely related to Tricholoma columbetta.
 
Description type:Non-original description 
Description:Tricholoma argyraceum (Bull.) Gillet - Fig. 2c, Plate 9
Tricholoma argyraceum (Bull.) Gillet, Hyménomycètes (1878) 103.
Agaricus argyraceus Bull., Herb. France (1779) pl. 423, fig. 1; Gyrophila argyracea (Bull.) Quél., Enchir. Fung. (1886) 12; Tricholoma scalpturatum var. argyraceum (Bull.) Kühn. & Romagn., Fl. anal. Champ. sup. (1953) 154.
Selected icons. Alessio & Rebaudengo, Micol. ital. 7 (1) (1978) pl. 19; Dähncke & Dähncke, 700 Pilze (1979) pl. 182; J. Lange, Fl. agar. dan. 1 (1935) pl. 23B; R. Phillips, Mushr. other Fungi (1981) 37 (as T inocybeoides); Riva, Tricholoma (1988) 27.
Selected descriptions and figures. M. Bon, Tricholomes France, Europe occ. (1984) 153 (as T. scalpturatum var. argyraceum); M. Bon, Fl. mycol. Eur. 2, Tricholomes (1991) 61; Riva, Tricholoma (1988) 248.
Iconotype: Agaricus argyraceus Bulliard, Herb. Fr. (1789) pl. 423.
Epitype (design. here): The Netherlands, Prov. Groningen, Verhildersum near Leens, 21 Sept. 1994, M. E. Noordeloos 9491 (L).
Pileus 15-60 mm, conico-convex to convex with pronounced conical umbo, with deflexed margin, expanding with age to convex or plano-convex, usually with acute umbo and deflexed to straight margin, marginal zone sometimes undulating and splitting with age, thin-fleshed, white or very pale cream-coloured (Mu. 10YR 8/2, 2.5 Y 8/2), at centre sometimes with brown fibrillose covering (10 YR 5-4/2, 10YR 5/3) that sometimes agglutinate in minute squamules, towards margin innately radially fibrillose, silvery shining, often distinctly staining yellow when old and bruised, particularly near the margin. Veil present in primordia, usually quickly disappearing, but sometimes visible in mature specimens as arachnoid fibrils at pileal margin. Lamellae, L = 60-80, 1 = 37, rather crowded, deeply emarginate, rarely broadly adnate, segmentiform to ventricose, then often extending under pileus, white or very pale grey, often staining yellow when old or bruised, with entire to eroded, concolorous edge. Stipe 20-50 x 3-8(-9) mm, cylindrical or tapering towards base, white, sometimes tinged pale grey in lower part, sometimes staining yellow when bruised, finely fibrillose-striate lengthwise, silky shining. Context thin, white. Smell farinaceous, sometimes weakly so, but then strongly farinaceous when cut. Taste farinaceous rancid.
Spores 4.5-6.0(-6.5) x 2.5-3.5 µm, Q = 1.4-2.l, av. Q = I.5-1.9, narrowly oblong with pronounced hilar appendage. Basidia 21-30 x 5.0-7.0 µm, 4-spored, clampless. Lamella edge sterile or heterogeneous with few to abundant, sometimes clustered cheilocystidia, 16.5-25.5 x 2.0-6.0 µm, versiform, subcylindrical to clavate or lageniform, thin-walled. Pileipellis a poorly differentiated cutis, rarely with a slightly tendency towards a trichoderm, made of narrow, cylindrical hyphae; elements 15-55(-70) x 2.5-7.5(-9.0) µm; sub-pellis not differentiated from pileitrama, made up of cylindrical to slightly inflated elements, 30-95 x 5.0-13(-17) µm. Pigment absent or pale yellow, membranal or very minutely incrusting. Stipitipellis a cutis of cylindrical hyphae, 2.0-6.0 µm wide. Caulocystidia absent or sparsely present, 15-24 x 2.5-6.0 µm, cylindrical to subclavate or irregularly shaped. Clamp-connections absent.
Habitat & distribution - Ectomycorrhizal with deciduous trees (Carpinus, Populus, Betula, Quercus, Tilia) in parks and woods on nutrient rich, sandy or clayey soil. Widespread all over Europe, but apparently rare.
 
Taxon name: