Taxonomy
Collection 1000442 (herbarium acc. no. TENN-F-018866) is Hebeloma nitidum. It is the holotype of heterotypic synonym Hebeloma politum Hesler (1977).Description
- arrow_drop_downarrow_drop_upCollecting details
Collection 1000442 was collected by L.R. Hesler on 23rd December 1948 in Knox, Tennessee, UNITED STATES (approx. 36.0186°N, 83.8472°W, altitude approximately 300 m above sea level - Google maps). The ectomycorrhizal family Pinaceae (genus Pinus) was present.
The surrounding habitat was described as coniferous woodland, 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. 1.4: Forest – Temperate.
According to the GPS data the collection was in the Appalachian-Blue Ridge 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 Cfa (Temperate, no dry season, hot summer).
- arrow_drop_downarrow_drop_upMacroscopic description
Cortina present: no.
Pileus: 20–70 mm diameter; shape convex; margin characters reflexed, smooth; viscosity tacky when moist; spotting no; hygrophanous not recorded; colour variation unicolor; with colour at centre greyish brown; and colour at margin not recorded; with remains of universal veil not recorded.
Lamellae: attachment adnate, emarginate; maximum depth not recorded; number of complete lamellae 63; tears absent; white fimbriate edge not recorded.
Stipe: 80–130 x 5–12 {median} x 5–12 {basal} mm; stipe Q 10.8–16.0; base clavate, cylindrical; floccosity fibrillose; rooting not recorded; mycelial chords not recorded.
Context: texture firm; stipe interior not recorded; stipe flesh discolouring from base no; slenderness measure 42.1; smell not recorded; taste not recorded.
Spore deposit colour: clay-buff.
Exsiccata: analysis not yet complete.
- arrow_drop_downarrow_drop_upMicroscopic description
Spores: shape amygdaloid; colour through microscope yellow brown; guttulate no; papillate yes; Spore Code: O3; O4; P2; D3.
Basidia: 25.6–33.9 x 5.5–6.6 μm; ave. Q = 4.8; basidia spore nature not recorded.
Cheilocystidia: main shape cylindrical, clavate-lageniform or clavate-ventricose, lageniform, pyriform, ventricose; special features many collapsed in exsiccata, septa; Cheilocystidia Ratios: A/M = 1.20; A/B = 1.03; B/M = 1.31.
Pleurocystidia: no.
Ixocutis: epicutis thickness (measured from exsiccata) 400 μm; ixocutis maximum hyphae width 6 μm; ixocutis hyphae encrustation no; shape of trama elements beneath subcutis ellipsoid, isodiametric, thickly sausage-shaped up to 17 μm wide.
Caulocystidia: caulocystidia maximum length 60 μm.
Spore (min) 5%-95% (max) mean median S.D. Length (µm) (8.2) 9.4–11.7 (11.9) 10.3 10.3 0.660 Width (µm) (4.7) 5.0–6.5 (7.1) 5.8 5.7 0.470 Q (1.61) 1.63–2.02 (2.15) 1.80 1.78 0.12 Cheilocystidium (µm) (min) 5%-95% (max) mean median S.D. Length (18) 20–40 (42) 29 28 6.78 Apex Width (2.2) 2.5–5.9 (7.7) 4.0 3.8 1.160 Median Width (2.3) 2.5–4.1 (5.9) 3.3 3.3 0.75 Basal Width (1.5) 2.3–5.3 4.2 4.5 0.97
- arrow_drop_downarrow_drop_upTemperature calculation
Max temp Min temp Precipitation Annualised average (1948) --- °C --- °C --- mm Collection month (12/1948) --- °C --- °C --- mm Max month (1948) --- °C --- °C --- 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 | 94.0 | 67.14 | 2nd/14 |
| Average length | 10.3 | 9.86 | 1st/14 |
| Average width | 5.8 | 5.96 | 12th–14th/14 |
| Standard deviation of length | 0.66 | 0.53 | 1st/14 |
| Standard deviation of width | 0.47 | 0.29 | 1st/14 |
| Median length | 10.3 | 9.89 | 1st–2nd/14 |
| Median width | 5.7 | 5.99 | 14th/14 |
| Minimum length | 8.2 | 8.56 | 14th/14 |
| Minimum width | 4.7 | 5.26 | 14th/14 |
| Low length | 9.4 | 8.99 | 1st/14 |
| Low width | 5.0 | 5.47 | 14th/14 |
| High length | 11.7 | 10.69 | 1st/14 |
| High width | 6.5 | 6.41 | 4th–6th/14 |
| Max length | 11.9 | 10.89 | 1st/14 |
| Max width | 7.1 | 6.53 | 1st/14 |
| Spore feature | Value | Commonalities |
|---|---|---|
| Ornamentation | O3; O4 | 100% of collections; 100% of collections |
| Perispore loosening | P2 | 28% of collections |
| Dextrinoidity | D3 | 78% of collections |