Full name: Hebeloma mediorufum Soop, Bulletin trimestriel de la Société Mycologique de France 117 (2): 130 (2001)
Genus: Hebeloma
Section: 'Mediorufa'

Types: NEW ZEALAND: South Island, Walker Creek Rest Area, Te Anau (approx. 45.1006°S, 167.9684°E, alt. approx. 270 m a.s.l.) under Nothofagus sp., 17 Apr. 1999, K. Soop (Holotype. herbarium acc. no. PDD 70514, HJB1000547).

  • arrow_drop_downarrow_drop_upEtymology
  • arrow_drop_downarrow_drop_upOriginal diagnosis
    Pileo 3.5 - 6 cm, globoso, deinde convexo, ex viscoso glutinoso, haud hygrophano, pallide griseobrunneo usque rufo, glabro; margine pallidior, albo-canescente, junior subpruinoso, senior substriato. Lamellis primo albo-griseis, confertis, acie pallidior. Stipite ex aequali subattenuato, subcurto, albo-canescente, tenuiter albo-micaceo, apice pruinoso. Velo valde sparso, probabiliter albo; cortina nulla. Carne alba, odore saporeque nullis. Sporis amygdaloideis, 9.3 - 11.5 x 6-6.8 μm, verrucosis. Reactio ope NaOH nulla. In silvis cum Nothofagete, subfrequente.
  • arrow_drop_downarrow_drop_upEnglish translation
    Pileus 3.5-6 cm, globose, then convex, viscid to glutinous, non hygrophanous, pale greyish-brown to red, glabrous; margin paler, white-hoary, subpruinose when young, substriate in age. Lamellae at first whitish-grey, crowded, with paler edge. Stipe equal to slightly tapered, somewhat short, white-hoary, slightly glittering with white mica-like particles, pruinose at the apex. Veil strongly scattered, most likely white; cortina none. Context white, smell and taste none. Spores amygdaloid, 0.3-11.5 x 6-6.8 μm, roughened. No reaction with NaOH. Rather frequent in woods with Nothofagus.


  • arrow_drop_downarrow_drop_upThresholds
Description of Hebeloma mediorufum based on 13 collections
  • arrow_drop_downarrow_drop_upMacroscopic description
    Pileus: (35) 47 (60) mm diameter; shape often convex or broadly umbonate; characters Not recorded; margin characters sulcate, often involute; viscosity tacky when moist; colour variation often unicolour or two color; colour at centre Not recorded.

    Lamellae: attachment emarginate; maximum depth up to 5 mm; number of complete lamellae 80–90; presence of tears absent; white fimbriate edge present.

    Cortina presence: no.

    Stipe: (40) 55 (70) x (9) 11 (13) {median} x (7) 9 (11) {basal} mm; stipe Q 4.4–5.4; base shape often clavate, cylindrical or tapering; floccosity pruinose at apex, often fibrillose; rooting no; thick rhizoids at base absent;

    Context: Texture firm; stipe interior hollow or superior wick; stipe flesh discolouring no; slenderness measure up to 5.7; smell often odourless or fruit; taste none where recorded.

    Spore deposit colour: Not recorded.

    Exsiccata characters: Not recorded.

  • arrow_drop_downarrow_drop_upMicroscopic description
    Spores: shape amygdaloid, often limoniform; colour in microscope often brown or yellow brown; guttules variable. papilla often yes or very strongly; Spore Code: O3 (O4); P3; D3 D4.

    Basidia: 29–33 x 6–9 μm; ave. Q up to 3.9; spore arrangement 4 spored;

    Cheilocystidia: main shape often capitate or clavate-stipitate, occasionally capitate-stipitate, cylindrical or spathulate-stipitate; special features observed often septa, occasionally bifurcate, irregular, many collapsed in exsiccata or rostrate; cheilocystidia ratios: A/M = 2.15–2.32; A/B = 2.25–2.64; B/M = 0.89–1.04.

    Pleurocystidia: none seen.

    Ixocutis: epicutis thickness (measured from exsiccata) up to 150 μm; ixocutis hyphae width up to 8 μm; ixocutis hyphae encrustation yes; shape of trama elements beneath subcutis cylindrical, ellipsoid or thickly sausage-shaped up to 17 μm wide.

    Caulocystidia: Similar to cheilocystidia but larger, up to 95 μm.

  • arrow_drop_downarrow_drop_upSpore measurements
  • arrow_drop_downarrow_drop_upCheilocystidia measurements
  • arrow_drop_downarrow_drop_upHabitat and distribution
    Hebeloma mediorufum's preferred habitat appears to be deciduous woodland. Where only one possible associate was recorded, that associate has always been Nothofagus (family Nothofagaceae). We have additional records where Fagus, Melaleuca, Populus and Quercus were recorded as possible associates, but in these cases a number of possible associates were mentioned. Overall the most commonly recorded families are Nothofagaceae (72.7%), Myrtaceae (18.2%), Fagaceae (18.2%) and Salicaceae (9.1%) The growth habit of our collections was often scattered, occasionally solitary and rarely caespitose or gregarious.

    According to our current collections, the species is found only in Australasia. On the continent, collections has been found in the WWF biomes The World Wildlife Fund (WWF) have divided the world into 867 terrestrial ecoregions. The ecoregion here is estimated by mapping from the GPS coordinates of the collection using data made available by Dinerstein et al (2017). Use this webtool to explore the ecoregions visually or see a full list of current ecoregions on Wikipedia. temperate broadleaf & mixed forests (70.0%) and montane grasslands & shrublands (30.0%), specifically including the ecoregions: New Zealand North Island temperate forests (30.0%), New Zealand South Island montane grasslands (30.0%) and Nelson Coast temperate forests (20.0%). From collector information, it appears collections have been found in the 1.4 Forest – Temperate (80.0%) and 14.5 Urban Areas (20.0%) IUCN habitats We map from the collector's description of the habitat to the International Union for Conservation of Nature (IUCN)'s definition using a standardised set of rules. Please see this page for a full list of IUCN habitats.. Within Australasia all our records are from New Zealand (New Zealand).

Geographic distribution
  • arrow_drop_downarrow_drop_upAdditional cited collections

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