Taxonomy
Collection 10806 (herbarium acc. no. C JV-86-625) is Hebeloma nigellum. It is the holotype of heterotypic synonym Hebeloma atrobrunneum Vesterh. (1989).Description
- arrow_drop_downarrow_drop_upCollecting details
Collection 10806 was collected by J. Vesterholt (86-625) on 5th September 1986 in Allerod,Allerod, Sortemosen, NEZ, DENMARK (approx. 55.86°N, 12.36°E, altitude approximately 60 m above sea level - Google maps). The ectomycorrhizal families Betulaceae (genus Betula), Pinaceae (genus Picea) and Salicaceae (genera Populus and Salix) were present.
The surrounding habitat was described as not recorded with a substrate of boggy, decomposed soil.
According to the GPS data the collection was in the Baltic mixed forests WWF ecoregion 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. (biome: Temperate Broadleaf & Mixed Forests) and Koppen climate code Dfb (Cold, no dry season, warm summer).
- arrow_drop_downarrow_drop_upMacroscopic description
Cortina present: yes.
Pileus: 8–24 mm diameter; shape convex; margin characters not recorded; viscosity tacky when moist; spotting no; hygrophanous no; colour variation two-colour; with colour at centre not recorded; and colour at margin greyish brown; with remains of universal veil yes.
Lamellae: attachment adnate, emarginate; maximum depth up to 6 mm; number of complete lamellae 27; tears absent; white fimbriate edge weak.
Stipe: 12–35 x 1–3 {median} x 1–3 {basal} mm; stipe Q 8.0–11.7; base cylindrical; floccosity floccose at apex; rooting no; mycelial chords no.
Context: texture firm; stipe interior hollow; stipe flesh discolouring from base yes; slenderness measure 14.5; smell raphanoid; taste bitter weakly, raphanoid.
Spore deposit colour: analysis not yet complete.
Exsiccata: pileus blackening.
- arrow_drop_downarrow_drop_upMicroscopic description
Spores: shape amygdaloid, ellipsoid, ovoid; colour through microscope yellow; guttulate no; papillate no; Spore Code: O2; P0; D3.
Basidia: 25.1–28.1 x 7.4–8.6 μm; ave. Q = 3.4; basidia spore nature not recorded.
Cheilocystidia: main shape lageniform, ventricose; special features many collapsed in exsiccata; Cheilocystidia Ratios: A/M = 1.04; A/B = 0.55; B/M = 1.94.
Pleurocystidia: no.
Ixocutis: epicutis thickness (measured from exsiccata) 75 μm; ixocutis maximum hyphae width 5 μm; ixocutis hyphae encrustation no; shape of trama elements beneath subcutis thickly sausage-shaped.
Caulocystidia: analysis not yet complete.
Spore (min) 5%-95% (max) mean median S.D. Length (µm) (12.1) 12.4–15.2 (15.5) 13.4 13.2 0.770 Width (µm) (6.4) 6.6–8.1 (8.4) 7.3 7.3 0.470 Q (1.45) 1.65–2.01 (2.08) 1.83 1.85 0.13 Cheilocystidium (µm) (min) 5%-95% (max) mean median S.D. Length (38) 39–51 (52) 44 43 3.85 Apex Width (3.1) 3.4–5.8 (6.5) 4.6 4.6 0.760 Median Width (3.5) 3.6–5.6 4.6 4.6 0.74 Basal Width 7.3–10.7 (11.1) 8.7 8.5 1.18
- arrow_drop_downarrow_drop_upTemperature calculation
Max temp Min temp Precipitation Annualised average (1986) 10.37 °C 3.79 °C 48.18 mm Collection month (9/1986) 13.74 °C 7.10 °C 37.48 mm Max month (1986) 19.94 °C 12.35 °C 96.81 mm
- arrow_drop_downarrow_drop_upAnalyse this collection
Compare this collection to its species
This section compares data for this collection against its true species and also against the most likely species as determined by our identifier. More often than not these will be the same species, but where this is not the case, the data may be used to help explain why the identifier got it wrong.Image gallery
Detailed statistics
| Spore measurements | My value | Species mean value | Position |
|---|---|---|---|
| Count | 49.0 | 35.00 | 10th/26 |
| Average length | 13.4 | 12.15 | 1st–2nd/28 |
| Average width | 7.3 | 7.17 | 4th–10th/28 |
| Standard deviation of length | 0.77 | 0.75 | 9th–10th/26 |
| Standard deviation of width | 0.47 | 0.36 | 4th/26 |
| Median length | 13.2 | 12.15 | 2nd/26 |
| Median width | 7.3 | 7.18 | 3rd–12th/26 |
| Minimum length | 12.1 | 10.76 | 1st/27 |
| Minimum width | 6.4 | 6.44 | 13th–21st/28 |
| Low length | 12.4 | 11.14 | 1st/27 |
| Low width | 6.6 | 6.64 | 14th–15th/28 |
| High length | 15.2 | 13.30 | 1st/27 |
| High width | 8.1 | 7.66 | 2nd/28 |
| Max length | 15.5 | 13.74 | 2nd/27 |
| Max width | 8.4 | 7.84 | 2nd/28 |
| Spore feature | Value | Commonalities |
|---|---|---|
| Ornamentation | O2 | 86% of collections |
| Perispore loosening | P0 | 93% of collections |
| Dextrinoidity | D3 | 83% of collections |