Description: Fruitbodies growing singly, in groups or fascicles. Pileus 1.5–6.5 cm, convex, plano-convex, fi- nally applanate, sometimes with low broad umbo, dry, mat, not hygrophanous, not translucently striate, margin deep yellow to yellow-ochre, towards centre darker, deep ochre- rusty, yellow-brown to rusty brown, sometimes also with slight orange tinge, surface finely fibrillose-tomentose, to- mentose to tomentose-scaly, scales fine, appressed to slight- ly upraised. Lamellae medium crowded, L = 40–60, l = 1–5, 3–6 mm high, ventricose, near stipe emarginate and decur- rent with a small tooth, at first mat yellow, then deep yellow, finally rusty, sometimes slightly rusty spotted, edge even, pale yellow. Stipe 30–60 × 3–7(–10) mm, either slender and gradually thickened downwards or rather robust and cylin- drical, without traces of velum, upper part yellow, towards base deep yellow-ochre, ochre-rusty to rusty brown, surface finely pale yellow to yellow fibrillose-tomentose. Context typically deep yellow in pileus (like lamellae), but some- times also pale yellow; yellow-rusty in stipe. Taste moder- ately bitter to bitter. Smell rather distinct, earthy-raphanoid, musty, like Cortinarius traganus, in lamellae sometimes slightly iodoform-like.
Spores 7.2–9.2(–10.4) × 4.5–5.2(–5.6) μm, E = 1.5–1.8(–2.0), Q = 1.63, ellipsoid to ellipsoid-amygdali- form both in side and face view, with distinct suprahilar de- pression in side view, rusty yellow in KOH, wall rusty brown, ornamentation medium to coarse, verrucose to rugu- lose-verrucose, without suprahilar disc, dextrinoid, imma- ture spores not dextrinoid. Basidia 18–26 × 6–7 μm, 4(2)-spored, broadly cylindrical or slightly conical with me- dian constriction and attenuated basal part. Basidiolae 17–20 × 6 μm, resembling basidia. Cheilocystidia forming sterile band at edge, 20–40 × 5–8 μm, variable in shape: cylindrical, narrowly fusiform, fusiform-lageniform to nar- rowly lageniform, with more or less distinct globose head 3–5 μm in diam., sometimes not capitate, thin-walled, hyaline, sometimes partly or completely filled with a ho- mogeneous or finely granular rusty yellow content. Pleuro- cystidia not observed. Lamellar trama regular, hyphae 4–18 μm broad, cells cylindrical or slightly inflated, hya- line, with yellow wall, yellow coloured gloeoplerous hy- phae rarely present. Pileus cuticle a cutis with a transition to a trichoderm, whole layer rusty brown, lower part of dense- ly arranged hyphae, upper part of parallel to slightly as- cending hyphae forming the scales on the pileus surface, hyphae densely arranged in scalp, cells (4–)6–20 μm broad, cylindrical, narrowly ellipsoid or almost barrel-shaped, mostly 8–16 μm broad, with coarse rusty brown incrusta- tions forming patches or a tiger-like pattern, with rare to scattered, narrowly clavate, clavate to pyriform terminal cells up to 26 μm broad. Stipe cuticle a cutis of densely ar- ranged hyphae 4–8 μm broad, with fine rusty incrustations, at places with ascending hyphae or nests of such hyphae, caulocystidia or terminal elements of special shape not ob- served. Lamellae exuding yellow pigment when mounted in a 5% KOH.
- THE GENUS GYMNOPILUS (FUNGI, AGARICALES) IN THE CZECH REPUBLIC WITH RESPECT TO COLLECTIONS FROM OTHER EUROPEAN COUNTRIES