Micro-morphological features (basidiospores, basidia, cheilocystidia) of Hebeloma species found in the Rocky Mountain alpine zone. 1 H. vaccinum (holotype, Herb. PC) 2 H. aurantioumbrinum ZT12730 3 H. subconcolor ZT 13776 4 H. hiemale ZT9828 5 H. avellaneum DBG-F-019533 6 H. velutipes ZT6100 7 H. alpinum CLC2875 8 H. marginatulum ZT9002 9 H. alpinicola ZT13763 10 H. dunense ZT9001 11 H. mesophaeum ZT8082 12 H. excedens ZT7475 13 H. oreophilum ZT12733 14 H. hygrophilum CLC1462 15 H. nigellum ZT6425 16 H. spetsbergense micro in Fig. 22. Both two and four-spored basidiospores shown for 2, 5, 7, 8, 10, 12, 13, 15. Scale bar: 10 µm. All drawings by E. Horak.