Xerocomus longistipitatus (from holotype, DC 16-056). 2 & 4 Fresh basidiomata in the field and base camp. 3 Pore surface. 5 Transverse section through tube showing trama. 6 pleurocystidia. 7 Transverse section through tube edge showing cheilocystidia. 8 & 9 Radial section through pileipellis showing elements of pileipellis. 10 Caulocystidia. 11 Basidiospores. Bars 5, 7–9 = 50 μm. 6, 10–11 = 10 μm.