A survey of Hebeloma (Hymenogastraceae) in Greenland Author Eberhardt, Ursula https://orcid.org/0000-0003-1221-7074 Staatliches Museum fuer Naturkunde Stuttgart, Rosenstein 1, D- 70191 Stuttgart, Germany ursula.eberhardt@smns-bw.de Author Beker, Henry J. https://orcid.org/0000-0001-9620-1701 Rue Pere de Deken 19, B- 1040 Bruxelles, Belgium & Royal Holloway College, University of London, Egham, UK & Plantentuin Meise, Nieuwelaan 38, B- 1860 Meise, Belgium Author Borgen, Torbjorn https://orcid.org/0000-0003-1174-9466 Sensommervej 142, 8600 Silkeborg, Denmark Author Knudsen, Henning Hauchsvej 15, 1825 Frederiksberg, Denmark Author Schuetz, Nicole Staatliches Museum fuer Naturkunde Stuttgart, Rosenstein 1, D- 70191 Stuttgart, Germany Author Elborne, Steen A. Frederik VII's Vej 29, 3450 Allerod, Denmark text MycoKeys 2021 2021-04-19 79 17 118 http://dx.doi.org/10.3897/mycokeys.79.63363 journal article http://dx.doi.org/10.3897/mycokeys.79.63363 1314-4049-79-17 CEDC3742C169540583072E7995018533 Hebeloma excedens (Peck) Sacc.; Syll. fung. (Abellini) 5: 806, 1887. Fig. 11 Macroscopic description. Cap 1.0-4.0 cm in diameter, shallowly convex, campanulate, then almost applanate, broadly umbonate or not, viscid or greasy, with hygrophanous spots, cinnamon to orange-brown or dark brick in center and pale brown on most of the cap, almost unicolored, with or without velar remnants at margin, or with whitish rim, margin originally described as extending beyond the lamellae, thin-fleshed, universal veil sometimes visible on margin edge, partial veil present. Lamellae sinuate, subdecurrent, narrow, becoming broader and eroded, 3.5-5.5 mm broad, without droplets, very pale, cream with pinkish buff tint, number of lamellae {L} 36-48. Stem 1.5-5.0 x 0.2-0.4 cm, equal, slightly curved, pale cream, silky, pruinose above ring zone, dingier to dark brown below, but still pale with golden brown fibrils in zones, blackening towards base, tough, rubbery. Context whitish in cap and stem apex and yellowish brown in lower stem down to blackish at base. Smell raphanoid, rarely odorless. Spore deposit brownish olive. Figure 11. Hebeloma excedens A TB85.238, photograph T. Borgen B distribution of cited collections C spores x 1600 and D cheilocystidia x 1000 of TB85.238 in Melzer's reagent. Scale bars: 5 µm ; microphotographs H.K.J. Beker. Microscopic description. Spores ellipsoid, a few slightly ovoid, not papillate, 8.5-10.5 x 5-6 µm , ave. Q 1.5-2.0, very weakly ornamented (O1O2), perispore not noticeably loosening (P0), indistinctly dextrinoid (D0D1), pale yellow, rarely yellow brown, +/- guttulate. Basidia 20-33 x 6-8 µm , ave. Q = 3.2-4, clavate, mostly four-spored. Cheilocystidia usually lageniform or ventricose, sometimes cylindrical, occasionally geniculate or septate, subcapitate, on ave. 30-55 x 4-6 (apex) x 4-5 (middle) x 7-9 (base) µm , ratios A/M = 0.96-1.23, A/B = 0.60-0.71, B/M = 1.60-1.82. Epicutis an ixocutis, up to 90 µm thick (measured from exsiccata), ixocutis maximum hyphae width up to 6 µm , hyphae rarely encrusted, shape of trama elements beneath subcutis ellipsoid. Caulocystidia similar to cheilocystidia, but usually larger. Collections examined. S-Greenland : Paamiut, 62.01°N , 49.4°W , 23 Aug 1985, T. Borgen (TB85.238, C-F-5073), 10 m, with Salix glauca . W-Greenland : Kangerlussuaq near the Ice cap, 67.10°N , 50.23°W , 12 Aug 2000, A-M. Larsen, T. Borgen (TB00.086, C-F-103517), 40 m, with Salix glauca in a copse. Sisimiut, 1 km N of the village, 66.94°N , 53.67°W , 19 Aug 2000, E. Ohenoja (EO19.8.00.20, OULU F050653), 0 m, in heathland. Distribution. Known from three localities in southwestern Greenland. Originally described from New York State under Pinus and widespread across North America ( Cripps et al. 2019 ). Similar to H. mesophaeum and therefore likely to be confused and overlooked. Cripps et al. also describe recent records from alpine Rocky Mountains in Colorado and Montana. Habitat and ecology. Three collections, two of them with Salix glauca . In the Rocky Mountains, S. planifolia was the dominant host ( Cripps et al. 2019 ). Two of the localities are on acid soil.