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 alpinicola A.H. Sm., V. S. Evenson & Mitchel; Veiled species of Hebeloma in the western United States (Ann Arbor): 48, 1983. Fig. 7 Macroscopic description. Cap 1.2-4.5 cm in diameter, robust, fleshy, irregularly hemispherical to convex, somewhat domed or not, almost unicolored, center cinnamon to dark pinkish buff, dark olive buff or rarely umber, sometimes with grayish tones, outwards ocher and lighter buff not white towards margin, sometimes with hoary canescent coating that dries shiny, with weakly hygrophanous spots, dry, margin inrolled at first, and then turned down, partial veil present. Lamellae narrowly attached, slightly emarginate, or with a tooth, or pulling away, somewhat broad (2-5 mm), pale gray brown to milky coffee, number of lamellae {L} 30-44, edges white floccose, without watery droplets. Stem 1.5-7.0 x 0.2-0.8 cm, cylindrical, whitish pruinose at apex, often with a whitish ring zone, dingy ocher to sordid yellowish or fairly dark brown, longitudinally strongly fibrillose and striate in lower part, often darkening when bruised, base sometimes encrusted with sand or earth, solid or slightly hollow. Context dingy whitish, darker below, unchanging or flesh staining brown. Smell weakly raphanoid. Taste almost insipid to slightly bitter. Spore deposit near fulvous. Figure 7. Hebeloma alpinicola A HK18.322, photograph H. Knudsen B distribution of cited collections C spores x 1600 and D cheilocystidia x 1000 of HK18.322 in Melzer's reagent. Scale bars: 5 µm ; microphotographs H.K.J. Beker. Microscopic description. Spores ellipsoid or some slightly amygdaliform or ovoid, with rounded end, apiculus small, on ave. 8-10.5 x 5-6 µm , ave. Q = 1.55-1.85, smooth to slightly rough (O1), not guttulate, not or very slightly dextrinoid (D0D1), perispore not loosening (P0). Basidia clavate, mostly four-spored, 20-35 x 6-8 µm . Cheilocystidia lageniform or ventricose, on ave. 35-55 x 5-6.5 (apex) x 4.5-6.5 (middle) x 6.5-10 (base) µm , occasionally geniculate or bifurcate, sometimes septate. Ratios A/M = 0.95-1.24, A/B = 0.54-0.88, B/M = 1.43-2.17. Epicutis an ixocutis, up to 200 µm thick, maximum hyphae width to 8 µm , encrusted hyphae not seen, shape of trama elements beneath subcutis cylindrical. Caulocystidia similar to cheilocystidia, but generally larger. Collections examined. S-Greenland : Kangilinnguit, 61.23°N , 48.07°W , 12 Aug 1985, T. Borgen (TB85.099, C-F-5082), 95 m, with Salix glauca and Chamaenerion latifolium in heathland. Kangilinnguit, 61.23°N , 48.10°W , 6 Aug 1984, T. Borgen (TB84.063, C-F-103534), 25 m, with Salix glauca in scrubland. Kangilinnguit, 61.23°N , 48.07°W , 17 Aug 1985, T. Borgen (TB85.071, C-F-5081), 95 m, with Alnus alnobetulae . Narsarsuaq, 61.15°N , 45.42°W , 9 Aug 2018, H. Knudsen (HK18.010, C-F-111109), 185 m, with Salix glauca and Betula pubescens in scrubland. Narsarsuaq, airport area, 61.08°N , 45.26°W , 3 Aug 1984, T. Borgen (TB84.028, C-F-103559), 20 m, with Salix glauca and Betula glandulosa in scrubland. Paamiut, 62.01°N , 49.4°W , 1 Aug 2000, T. Borgen (TB00.049, C-F-103516), 10 m, with Salix herbacea in snowbed. Paamiut, 62.01°N , 49.4°W , 8 Aug 1981, T. Borgen TB81.111, C-F-103554), 25 m. Paamiut, 62.01°N , 49.4°W , 20 Aug 1985, T. Borgen (TB85.218, C-F-103532), 30 m, with Salix herbacea and Bistorta vivipara in snowbed. W-Greenland : Kobbefjord, NuukBasic Station, 64.078°N , 51.23°W , 25 Aug 2018, H. Knudsen (HK18.322, C-F-111116), 5 m, with Salix herbacea in tundra. Sisimiut, Kaellingehaetten , 66.93°N , 53.59°W , 16 Aug 2016, H. Knudsen (HK16.165, C-F-108401), 400 m. N-Greenland : Zackenberg, Ulvehoj , 74.47°N , 21°W , 7 Aug 1999, T. Borgen (TB99.238, C-F-119805), 40 m, with Salix arctica and Bistorta vivipara . E-Greenland : Kuummiut, Torsukattak, 65.87°N , 37.01°W , 2 Aug 2008, T. Borgen (TB08.039, C-F-101623), 35 m; with Salix glauca in heathland. Kuummiut, Torsukattak, 65.87°N , 37.01°W , 2 Aug 2008, T. Borgen (TB08.037, C-F-101621), 35 m. Distribution. Widely distributed in Greenland, only missing in Constable Pynt. Originally described from the Seven Devils Mountains in Idaho, North America by Smith et al. (1983) , more recently from the Rocky Mountains by Cripps et al. (2019) and from the European Alps by Grilli et al. (2020) . This species appears to favor both boreal and arctic or alpine habitats. Most collections from Rocky Mountains were from subalpine areas. In Greenland, it occurs from the Subarctic zone to the High Arctic zone, and the Greenland collections from Zackenberg are the northernmost known (74.47°N). Circumpolar, arctic-alpine. Habitat and ecology. Thirteen collections in all, mainly with Salix glauca in scrubs and heathland, three collections in snowbeds with S. herbacea , one collection with S. arctica , and one collection with Alnus alnobetulae ssp. crispa , but the presence of other possible associates should not be ruled out. In the Rocky Mountains, Cripps et al. (2019) found two collections, one with Dryas , Salix planifolia Pursh. and S. reticulata L., the other subalpine record with dwarf willows only. Hebeloma alpinicola seems not to be specific regarding soil conditions.