Truncocolumella pseudocolumella. A  Basidiomata; B, C Dry peridium turning black when stained with 5% KOH; D A section of basidiomata in 5% KOH; E A section of the hymenium in lactophenol cotton blue; G-I Basidia in 5% KOH (H. 4-spored basidia, I. 2-spored basidia); F, J Basidiospores in 5% KOH. Scale bars: A = 1 cm; B, C = 0.5 cm; D = 50 μm; E, G, H, I = 20 μm; F, J = 10 μm.