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Taxonomy

Full name: Hebeloma nothofagetorum B.J. Rees, Mycologia 105 (4): 1051 (2013)
Genus: Hebeloma
Section: 'Mediorufa'

Types: AUSTRALIA: Tasmania: near Waldheim Chalet, Cradle Mountain, Cradle Mountain Nat Park (41.6358°S, 145.9492°E, alt. approx. 895 m a.s.l.) on soil under Nothofagus cunninghamii, 1 May 2005, R.E. Halling (Holotype. herbarium acc. no. HO 553022, HJB1000298).

  • arrow_drop_downarrow_drop_upEtymology
  • arrow_drop_downarrow_drop_upDiagnosis
    Pileus 20–75 mm, circular, broadly umbonate, reflexed at the margin, which may be striate in older fruit bodies; color variable, warm ochraceous pink (5B3–7B3) with a deeper pinkish tan center (6C5–8D6); shiny, viscid (drier at the margin), surface easily peeled, generally glabrous, tomentose at the disk when dry; context cream white with a water-soaked line just above the lamellae; no obvious velar remains. Lamellae adnexed to sinuate, close, pinkish to pale coffee brown (5A3), thin, sometimes with clear fluid droplets at the whitish, fimbriate margin, 7 mm deep, two sets of lamellulae. Stipe 30–55 x 8–15 mm at the apex, tapering to 7–12 mm at the base, pruinose at the apex, longitudinally fibrillose throughout, darkening with handling, and with fine fibrils collecting spores throughout. No obvious velar remains. Flavor bitter. Odor not recorded. Spore print pale pink becoming dark brown on drying. Basidiospores [50/5/5] 9.7–12.8(–13.6) x (5.3–) 6.2–7.5 μm, Q = 1.51–1.73, inequilateral, elliptic to citriform, verrucose with a prominent perispore, and some thinning of the spore wall at the apex, fairly strongly dextrinoid (D3), perispore somewhat loosening in few spores (P1), spores with fairly strong ornamentation, always easy to see without oil immersion (O4). Basidia clavate, three- and four-spored, 33–43 x 9–11 μm, slightly swollen at the center with prominent sterigmata to 8 mm long. Cheilocystidia 30–60 x 8–14 μm, cylindrical with a prominent, at times abruptly capitate apex 10–13 μm wide that occasionally bifurcates to resemble large bone endings, also occasionally septate, slightly terminally thickened, hyaline. Pleurocystidia not observed. Caulocystidia consisting of occasional finger-like to broadly clavate endings present on long hyphal cells 2.5–3.5 μm wide, at stipe apex only. Pileipellis an ixocutis consisting of a surface layer of fine, slender, interwoven to collapsed, gelatinized, unclamped cells above a very narrow layer of slightly wider cells 3.5–4.0 mm wide, cells of the pileus trama more inflated and almost spherical, 10–30 μm diam.

Description

  • arrow_drop_downarrow_drop_upThresholds
Description of Hebeloma nothofagetorum based on 22 collections
  • arrow_drop_downarrow_drop_upMacroscopic description
    Pileus: (20) 47 (75) mm diameter; shape broadly umbonate; characters remains of universal veil; margin characters reflexed or sulcate; viscosity tacky when moist; colour variation two color; colour at centre often cinnamon or brick.

    Lamellae: attachment adnexed or emarginate; maximum depth up to 7 mm; number of complete lamellae up to 84; presence of tears visible with x10 lens; white fimbriate edge present.

    Cortina presence: no.

    Stipe: (30) 42 (55) x (8) 11 (15) {median} x (7) 9 (12) {basal} mm; stipe Q 3.7–3.8; base shape tapering; floccosity fibrillose or pruinose at apex; rooting Not recorded; thick rhizoids at base Not recorded;

    Context: Texture firm; stipe interior Not recorded; stipe flesh discolouring yes; slenderness measure up to 4.2; smell usually odourless; taste Not recorded.

    Spore deposit colour: Not recorded.

    Exsiccata characters: Not recorded.

  • arrow_drop_downarrow_drop_upMicroscopic description
    Spores: shape amygdaloid or limoniform; colour in microscope yellow brown; guttules no. papilla very strongly; Spore Code: O3; P3; D3 D4.

    Basidia: 25–29 x 6–7 μm; ave. Q up to 3.8; spore arrangement 4 spored;

    Cheilocystidia: main shape capitate-stipitate, clavate-stipitate or spathulate-stipitate; special features observed often irregular; cheilocystidia ratios: A/M = up to 1.95; A/B = up to 2.12; B/M = up to 0.93.

    Pleurocystidia: none seen.

    Ixocutis: epicutis thickness (measured from exsiccata) up to 125 μm; ixocutis hyphae width up to 6 μm; ixocutis hyphae encrustation yes; shape of trama elements beneath subcutis cylindrical or thickly sausage-shaped up to 15 μm wide.

    Caulocystidia: Similar to cheilocystidia but larger, up to 90 μm.

  • arrow_drop_downarrow_drop_upSpore measurements
  • arrow_drop_downarrow_drop_upCheilocystidia measurements
  • arrow_drop_downarrow_drop_upHabitat and distribution
    Hebeloma nothofagetorum's preferred habitat appears to be woodland pathside with mossy soil, soil or boggy soil. Where only one possible associate was recorded, the most commonly recorded associate was Nothofagus (85.7%) but Pomaderris (14.3%) were also recorded. In these cases the most commonly recorded families were Nothofagaceae (85.7%) and Rhamnaceae (14.3%). We have additional records where Eucalyptus (55.6%) and Acacia (5.6%) were recorded as possible associates, but in these cases a number of possible associates were mentioned. Overall the most commonly recorded families are Rhamnaceae (55.6%), Myrtaceae (55.6%), Nothofagaceae (44.4%) and Mimosoideae (5.6%) The growth habit of our collections was often scattered and occasionally solitary.

    According to our current collections, the species is found only in Australasia. On the continent, collections have been found only in the temperate broadleaf & mixed forests WWF biome 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. (Tasmanian temperate forests (63.6%) and Tasmanian Central Highland forests (18.2%) ecoregions). From collector information, it appears collections have been found in the 1.4 Forest – Temperate (88.2%) and 5.4 Wetlands (inland) – Bogs, marshes, swamps, fens, peatlands (11.8%) 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 Australia (Tasmania and Victoria).

Geographic distribution
Phenology
  • arrow_drop_downarrow_drop_upAdditional cited collections

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