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Taxonomy

Full name: Hebeloma lacteocoffeatum B.J. Rees, Mycologia 105 (4): 1050 (2013)
Genus: Hebeloma
Section: 'Mediorufa'

Types: AUSTRALIA: South Australia: Region 11: Southern Lofty. Kuitpo Gate, Gate 52. Near meadows (approx. 35.2211°S, 138.7114°E, alt. approx. 350 m a.s.l.) under Eucalyptus sp., 7 Jul. 2002, P.S. Catcheside (PSC1222), det: B.J. Rees (Holotype. herbarium acc. no. AD-C54373, HJB1000342).

  • arrow_drop_downarrow_drop_upEtymology
  • arrow_drop_downarrow_drop_upDiagnosis
    Pileus up to 74 mm diam, circular to slightly oval, low convex to broadly umbonate to plane or occasionally reflexed, margin decurved to slightly uplifted; pale buff to clay pink to coffee-colored (5A3) with darker brown streaks (6C4) at the disk; viscid becoming shiny, glabrous with a finely fibrillose margin, no velar remains; flesh off-white, 8 mm at the disk. Lamellae adnate to sinuate, ventricose, thin, fairly shallow (2–4 mm), pale milky coffee-colored (5B3) with a light cream fimbriate margin, two sets of lamellulae. Stipe stout, to 70 x 16 mm, central, cylindrical to slightly flattened, enlarged at the base, off-white, firm, with an upper central hollow, not viscid, finely longitudinally fibrillose, finely punctuate at the apex, no velar remains. Odor vaguely antiseptic to radish-like. Flavor astringent to slightly bitter. Spore print deep pinkish brown to rust. Basidiospores [30/3/3] 8.1–9.7 x 5.3–5.7(–6.2) μm, Q = 1.5–1.63, inequilateral, obovoid to almost limoniform with a narrow apex almost devoid of ornamentation, pale smoky-brown, verruculose, weakly to strongly dextrinoid (D2–3), perispore not loosening (P0), spores weakly ornamented, with ornamentation observed only under oil immersion (O2). Basidia clavate, 30–40 x 7–9 μm, four-spored, sterigmata to 6 mm. Cheilocystidia hyaline, almost cylindrical with a slightly enlarged, occasionally terminally thickened apex and infrequently with an enlarged base, 32–63 x 4–9 (apex), 5–8 (middle) and 4–9 μm (base). Pleurocystidia not observed. Caulocystidia like cheilocystidia, sparse at apex only. Pileipellis consisting of a thin layer of narrow, radially orientated, finely coiled, lightly gelatinized cells above a grayish brown subpellis of collapsed, roughly radially parallel, clamped, broader hyphae.

Description

  • arrow_drop_downarrow_drop_upThresholds
Description of Hebeloma lacteocoffeatum based on 11 collections
  • arrow_drop_downarrow_drop_upMacroscopic description
    Pileus: (19) 31–49 (50) mm diameter; shape convex; characters often hygrophanous; margin characters occasionally smooth, crenulate, involute, reflexed, sulcate or wavy; viscosity tacky when moist; colour variation usually unicolour, occasionally two color; colour at centre often fawn, occasionally clay-buff.

    Lamellae: attachment often emarginate, occasionally adnexed or decurrent tooth; maximum depth 5–7 mm; number of complete lamellae 64–72; presence of tears often absent or visible with naked eye; white fimbriate edge often present, occasionally very strong, rarely weak.

    Cortina presence: no.

    Stipe: (22) 32–52 (54) x (5) 6–14 (15) {median} x (8) 9–19 (20) {basal} mm; stipe Q 2.2–7.6; base shape often clavate, occasionally bulbous or cylindrical; floccosity occasionally floccose, floccose at apex, weakly floccose, pruinose at apex or fibrillose; rooting no; thick rhizoids at base absent;

    Context: Texture firm; stipe interior hollow, often superior wick; stipe flesh discolouring no; slenderness measure 1.8–12.4; smell occasionally odourless, fruit or raphanoid; taste often weakly bitter, occasionally none where recorded.

    Spore deposit colour: Not recorded.

    Exsiccata characters: Not recorded.

  • arrow_drop_downarrow_drop_upMicroscopic description
    Spores: shape amygdaloid, rarely limoniform; colour in microscope often brown or yellow brown; guttules yes. papilla often yes or weak; Spore Code: O2 O3; P0 P1; (D2) D3.

    Basidia: (18) 19–34 (36) x 5–8 μm; ave. Q 3.4–4.2; spore arrangement 4 spored;

    Cheilocystidia: main shape clavate-stipitate, often gently clavate, rarely clavate-lageniform or clavate-ventricose; special features observed often septa, rarely many collapsed in exsiccata; cheilocystidia ratios: A/M = 1.36–2.23; A/B = 1.52–2.40; B/M = 0.82–1.06.

    Pleurocystidia: none seen.

    Ixocutis: epicutis thickness (measured from exsiccata) up to 200 μm; ixocutis hyphae width up to 7 μm; ixocutis hyphae encrustation yes; shape of trama elements beneath subcutis often cylindrical or thickly sausage-shaped up to 17 μm wide.

    Caulocystidia: Similar to cheilocystidia but larger, up to 140 μm.

  • arrow_drop_downarrow_drop_upSpore measurements
  • arrow_drop_downarrow_drop_upCheilocystidia measurements
  • arrow_drop_downarrow_drop_upHabitat and distribution
    Hebeloma lacteocoffeatum's preferred habitat appears to be woodland pathside or woodland. Where only one possible associate was recorded, the most commonly recorded associate was Leptospermum (50.0%) but Eucalyptus (50.0%) were also recorded. In these cases the most commonly recorded family was Myrtaceae (100.0%). We have additional records where Pomaderris was recorded as a possible associate, but for these collections a number of possible associates were mentioned. Overall the most commonly recorded families are Myrtaceae (100.0%) and Rhamnaceae (16.7%) The growth habit of our collections was gregarious.

    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 rain forests (45.5%) and Northland temperate kauri forests (18.2%) ecoregions). From collector information, it appears collections have been found only in the 1.4 Forest – Temperate IUCN habitat 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 we have records from Australia (Tasmania and South Australia) and New Zealand (New Zealand).

Geographic distribution
Phenology
  • arrow_drop_downarrow_drop_upAdditional cited collections

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