Public Description of Gymnopilus sapineus (Fr.) Murrill

Title: Public Description
Name: Gymnopilus sapineus (Fr.) Murrill
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 Draft For Wild Mushrooms Of The Northeastern United States By Erlon (Private)

Description status: Unreviewed

General Description:

Characteristics in brief: Fruitbodies small to medium-sized, mostly slender but also robust, pileus typi- cally fibrillose-tomentose, tomentose to tomentose-scaly, rather deep coloured: margin deep yellow to yellow-ochre, towards the centre deep ochre-rusty, yellow-brown to rusty brown, lamellae typically deep yellow, then rusty, stipe without traces of velum, yellow-ochre, ochre-rusty to rusty brown with yellow fibrillose-tomentose surface, context mostly deep yellow in pileus, smell rather distinct, spores mostly 7.2–9.2 × 4.5–5.2 μm, ellipsoid-amygdaliform with distinct suprahilar depression, ornamentation medium to coarse, verrucose to rugulose-verrucose, without suprahilar disc, cheilocystidia cylindrical, narrowly fusiform, fusiform-lageniform to narrowly lageniform, with more or less distinct globose head 3–5 μm in diam., pileus cuticle of broad and coarsely incrusted hyphae (4–)6–20 μm in diam., with narrowly clavate, clavate to pyriform terminal cells. Growing as a saprophyte on dead wood of conifers, rarely also deciduous trees, almost exclusively in summer (June–August).

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Diagnostic Description:

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.


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Created: 2019-01-25 11:02:10 -05 (-0500) by Image Sharer (image sharer)
Last modified: 2019-01-25 11:02:10 -05 (-0500) by Image Sharer (image sharer)
Viewed: once, last viewed: 2019-01-25 11:02:11 -05 (-0500)