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According to our data Hebeloma stenocystis is not the name of a current valid species of Hebeloma. Our database has records for the following similar names
Full name: Hebeloma stenocystis J. Favre (1960)
Published: Catalogue desriptif des Chamigons Superieurs de la Zone Subalpine du Parc National Suisse 6 (Neue Folge): 496 (1960)
Taxonomic status: Heterotypic synonym of H. incarnatulum
Notes: Nom. inval. (Art. 40.1 - Melbourne).

Types: SWITZERLAND: Foret de Plan Ot, S-Charl (approx. 46.54°N, 9.87°E, alt. approx. 1900 m a.s.l.) on soil in coniferous, subalpine woodland under Pinus mugo, 7 Sep. 1952, J. Favre (Holotype. herbarium acc. no. G K13973, G 603, HJB12907).

No type was designated, but original material does exist, and was cited in Favre's original description, from Switzerland: GK13973.

Original diagnosis: Pileo usque ad 55 mm lato, viscoso, margine albido et subtiliter pubescenti, in centro satis obscure rufo-brunneo (g1 Lange), in ambitu pallide brunneo-ochraceo (k6-g3 idem). Cortina nulla. Lamellis tenuibus, confertis (54-60; lam = 7 vel 3), plorantibus, primus albidis, deinde griseo-brunneo-ochraceis, potius obscuris, acie praefimbriata serrulataque. Stipite usque ad 70 x 9-11,5 mm, albido, dein, ad basim, pallide brunneo, sursum dense floccoso, deorsum fibroso. Carne albida, dein, in stipites, pallide brunnea, amara, debilissimo raphani odore. Spores subtilites verrucosis, 10,5-12,5 x 5-5,5-7 μm. Pilis lamellarum aciei, 75-100 μm longis; ad apicem usque ad 7,5 μm latis. In locis variis.

English translation: Pileus up to 55 mm broad, viscid, with white, subtly pubescent margin, at centre moderately dark reddish brown (g1 Lange), in the periphery pale brown-ochre (k6-g3 idem). Cortina absent. Lamellae thin, crowded (54–60 with 3–7 lamellulae), weeping, white at first, then greyish brown ochre, rather dark, with fimbriate and serrulate edge. Stipe up to 70 × 9–11.5 mm, white, then pale brown at base, at apex densely floccose, downwards fibrillose. Context white, then pale brown in stipe, bitter, with weak raphanoid odour. Spores subtly verrucose, 10.5–12.5 × 5–5.5–7 μm. Hairs at lamella edge 75–100 μm long, at apex up to 7.5 μm broad. In various places.

Commentary: Original material does exist. We have studied this material both morphologically and molecularly. This material represents: = Hebeloma incarnatulum A.H. Sm.

Full name: Hebeloma stenocystis J. Favre ex Quadr. (1989) [“1988”]
Published: Mycol. Helv. 3 (2): 197 (1989) ["1988"]
Taxonomic status: Heterotypic synonym of H. velutipes
Notes: Intended as a replacment name for Hebeloma stenocystis J. Favre.

Types: FRANCE: Haute Savoie, Col de Saxel, Mont Voirons, (45.574°N, 6.1309°E, alt. approx. 1200 m a.s.l.) under Abies alba, 11 Oct. 1984, L. Quadraccia (Holotype. herbarium acc. no. ROHB00907, HJB1000219).

Original diagnosis: Pileus 30-60 mm latus, convexus-umbonatus, deinde expansus, saepissimo lato umbone obtuso praeditus, gibbosus, margine sinuoso-lobato, cuticula aequalis, glabra, in medio praecipue iove viscosa, in margine subviscosa vel sicca, rare vix igrophana, margo plus minusve pruinosus; subconcolor, a cremeo-albido ab pallido helvolum, margine pallidus, interdum discolor, in medio fusco-armeniacus, margine gradatim pallidus. Lamellae confertae, 5-8.5 mm latae, adnato-emarginatae, lamellulis sinuoso-rotundatis interpositis, guttulae lacteas exsudantes et deinde vix fuscomaculatae; primum pallidae, albido-ochraceae, lacteo-coffeatae, usque ad sordido ochraceas; acies albida erosa. Stipes 28-70 x 6-10 mm, firmus, subcylindraceus bulbo imarginato plus minusve perspicuo (x 9-15 mm latus) praeditus, plenus vel farctus plus minusve cavus, paeno flocculosus apice, dense pruinosus usque ad infimam partem; albus, ima parte leviter fuscescens praesertim sporocarpibus maturitate et tactu. Cortina nulla. Caro in medio pileo valde crassa, albida, ad stipitis basim vix fuscescens praecipue imbuta vel tactu; odor plus minusve herbaceo lecto, herbaceus vel tenui raphanoides secto; sapor tenui raphanoideus, amariusculus post longo mansu. Sporae (10-)11-13-14 x (5.5-)6-7(-7.5) μm, amygdaliformes vel subamygdaliformes, dense verrucosae, flavidae sub microscopico optico, dextrinoideae sed paulum. Basidia 35-40 x 8-10 μm, tetrasporica. Cheilocystidia (40)50-95(105) μm, clavata, passim attenuata septo basale, x 2.5-4 μm, apex dilatatus usque ad subcapitatum, x 6-9 μm, interdum epiphysiformes, x 10-11 μm, cheilocystidia breviora saepe sublageniformia plus minusve ventricosa ima parte, x 5-8 μm. Pleurocystidia nulla. Caulocystidia cheilocystidiis similia sed usque ad 150 μm longa et saepe plus minusve lageniformia, recta, flexuosa vel geniculata, basi ventricosa, x 8-11 μm et apex obtusus vel subcapitulatus, x 4-8 μm. Epicutis ab ixocutis perspicua composita, ex hyphis gracilibus, x 2.5-4 μm, saepe summa parte pileocystidibus similibus caulocystidibus; cutis manifesta, hyphis laterioribus constituta, x 5-6.5 um; subcutis manifestissime pseudoparenchymatica-intermedia, hyphis leviter pigmentatis consituta pigmento membranario albido ac subtile. Fubulae adsunt. Habitat praesertim in locis montanis, 1200-1900 metra supra mare, sub arboribus coniferis (Abietibus, Piceis, Pinis).

English translation: Pileus 30–60 mm broad, convex-umbonate, then expanding, very often with low, broad umbo, gibbose, with sinuate-lobed margin. Cuticle equal, glabrous, at centre viscous, towards margin subviscous to dry, rarely slightly hygrophanous, more or less pruinose at margin, subconcolourous, whitish cream to pale reddish-yellow, paler towards margin, sometimes discoloured with reddish-brown or apricot centre, and gradually paler margin. Lamellae crowded, 5–8.5 mm broad, adnate-emarginate, interspersed with sinuate-rounded lamellulae, exuding milky droplets and then brown spotted; pale at first, whitish-ochre, milky-coffee to sordid ochre; with eroded, whitish edge. Stipe 28–70 × 6–10 mm, firm, subcylindrical with more or less distinct marginal bulb (× 9–15 mm), stuffed to hollow, subflocculose at apex, entirely densely pruinose, white, brownish towards base, particularly when handled or old. Cortina absent. Context in middle of pileus very thick, white, at base of stipe brownish, especially when old and handled; odour more or less herbaceous, herbaceous to slightly raphanoid when cut; taste slightly raphanoid, slightly bitter after mastication. Spores (10–)11–13–14 × (5.5–)6–7(–7.5) μm, amygdaloid to subamygdaloid, densely verrucose, yellowish under microscope, slightly dextrinoid. Basidia 35–40 × 8–10 μm, four-spored. Cheilocystidia (40)50–95(105) μm, clavate, usually attenuate towards septum, × 2.5–4 μm, apex broadened to subcapitate, × 6–9 μm, epiphysiform, × 10–11 μm, the shorter cheilocystidia often sublageniform with more or less ventricose lower part, × 5–8 μm. Pleurocystidia absent. Caulocystidia similar to cheilocystidia but up to 150 μm long and often more or less lageniform, straight, flexuous or geniculate with ventricose base, × 8–11 μm with blunt or subcapitate apex, × 4–8 μm. Epicutis a distinct ixocutis of slender hyphae, × 2.5–4 μm, often ending in pileocystidia similar to caulocystidia; cutis manifest, of broader hyphae, × 5–6.5 μm; subcutis very manifest, subparenchymatical composed of slightly pigmented hyphae with white, delicate membranal pigment. Clamps present. Habitat in mountainous areas between 1200–1900 m a.s.l., under conifers (Abies, Picea, Pinus).

Commentary: Quadraccia clearly erected this species to validate Favre’s earlier species, which was invalid because no type had been designated. Unfortunately, rather than citing Favre’s material, Quadraccia designated new material. We have studied the type designated by Quadraccia and the morphology plus various loci sequences confrm this is: = Hebeloma velutipes Bruchet.

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