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Hebeloma arcticum HK16.119 (holotype) A spores ×1600 and B spore ornamentation ×1600 in Melzer’s reagent C spores and D spore ornamentation ×1600 in KOH E basidia cheilocystidia and F cheilocystidia ×1000 in Melzer’s reagent G caulocystidia ×500 in KOH H cutis ×125 in KOH. Scale bars: 5 µm (A–F); 10 µm (G); 50 µm (H); microphotographs H.K.J. Beker.
