Taxonomy
Collection 12038 (herbarium acc. no. BR-MYCO 173979-58 (holotype)) is the holotype of Hebeloma perexiguum.Description
- arrow_drop_downarrow_drop_upCollecting details
Collection 12038 was collected by H.J. Beker, M.L. Beker on 18th August 2007 in London, SVALBARD (78.9631°N, 12.0503°E, altitude approximately 5 m above sea level - Google maps). The ectomycorrhizal family Salicaceae (genus Salix) was present.
The surrounding habitat was described as arctic tundra with a substrate of soil, corresponding to the 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. 4.1: Grassland – Tundra.
According to the GPS data the collection was in the Koppen climate code ET (Polar, tundra).
- arrow_drop_downarrow_drop_upMacroscopic description
Cortina present: no.
Pileus: 7–12 mm diameter; shape convex; margin characters smooth; viscosity tacky when moist; spotting no; hygrophanous no; colour variation unicolor; with colour at centre greyish brown; and colour at margin greyish buff; with remains of universal veil no.
Lamellae: attachment emarginate; maximum depth not recorded; number of complete lamellae 25; tears absent; white fimbriate edge present.
Stipe: 10–15 x 2 {median} x 2 {basal} mm; stipe Q 5.0–7.5; base cylindrical; floccosity pruinose; rooting no; mycelial chords no.
Context: texture firm; stipe interior not recorded; stipe flesh discolouring from base weak; slenderness measure 8.3; smell not recorded; taste not recorded.
Spore deposit colour: analysis not yet complete.
Exsiccata: pileus blackening.
- arrow_drop_downarrow_drop_upMicroscopic description
Spores: shape amygdaloid; colour through microscope brown yellow; guttulate no; papillate yes; Spore Code: O1; P0; D1.
Basidia: 30.9–42.6 x 8.9–10.1 μm; ave. Q = 3.9; basidia spore nature not recorded.
Cheilocystidia: main shape clavate, clavate-lageniform or clavate-ventricose, lageniform, spathulate-stipitate, ventricose; special features apical thickening, septa; Cheilocystidia Ratios: A/M = 1.75; A/B = 1.45; B/M = 1.33.
Pleurocystidia: no.
Ixocutis: epicutis thickness (measured from exsiccata) 30 μm; ixocutis maximum hyphae width 6 μm; ixocutis hyphae encrustation yes; shape of trama elements beneath subcutis angular, thickly sausage-shaped up to 16 μm wide.
Caulocystidia: caulocystidia maximum length 75 μm.
Spore (min) 5%-95% (max) mean median S.D. Length (µm) (8.8) 9.9–13.4 (14.8) 11.7 11.7 1.150 Width (µm) (6.2) 6.4–8.1 (8.4) 7.2 7.2 0.560 Q (1.34) 1.43–1.86 (1.90) 1.63 1.64 0.12 Cheilocystidium (µm) (min) 5%-95% (max) mean median S.D. Length (35) 40–65 (78) 54 52 10.65 Apex Width (5.8) 6.7–10.6 (16.9) 8.5 8.2 1.560 Median Width (3.6) 3.8–5.9 (6.2) 4.8 5.0 0.66 Basal Width (3.5) 3.9–9.8 (10.7) 6.4 5.8 1.82
- arrow_drop_downarrow_drop_upTemperature calculation
Max temp Min temp Precipitation Annualised average (2007) -0.60 °C -4.61 °C 35.62 mm Collection month (8/2007) 5.51 °C 2.30 °C 34.31 mm Max month (2007) 5.70 °C 2.31 °C 97.30 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 | 56.0 | 56.00 | 1st/1 |
| Average length | 11.7 | 11.70 | 1st/1 |
| Average width | 7.2 | 7.20 | 1st/1 |
| Standard deviation of length | 1.15 | 1.15 | 1st/1 |
| Standard deviation of width | 0.56 | 0.56 | 1st/1 |
| Median length | 11.7 | 11.70 | 1st/1 |
| Median width | 7.2 | 7.20 | 1st/1 |
| Minimum length | 8.8 | 8.80 | 1st/1 |
| Minimum width | 6.2 | 6.20 | 1st/1 |
| Low length | 9.9 | 9.90 | 1st/1 |
| Low width | 6.4 | 6.40 | 1st/1 |
| High length | 13.4 | 13.40 | 1st/1 |
| High width | 8.1 | 8.10 | 1st/1 |
| Max length | 14.8 | 14.80 | 1st/1 |
| Max width | 8.4 | 8.40 | 1st/1 |
| Spore feature | Value | Commonalities |
|---|---|---|
| Ornamentation | O1 | 100% of collections |
| Perispore loosening | P0 | 100% of collections |
| Dextrinoidity | D1 | 100% of collections |