Fruitbody one. Pileus 2 x 0.4 cm, light yellow-brown, continuous, glabrous. Hymenium rust-brown. Stipe 4 x 0.3 cm, equal, smooth. Pileus cuticle a palisade ixotrichodermium; terminal cells 4 - 6.5 µm diam. (d^m = 6.5 µm), equal, hyaline in KOH, yellow in Melzer's. Tube trama hyphae 2.5 - 8 µm diam. (d = 5 µm), boletoid, hyaline in KOH, yellow in Melzer's. Clamp connections absent. Basidia (19.5-) 26 - 34 x 8 - 10.5 µm (D^m = 30 x 9 µm), thin-walled, clavate to narrowly clavate to subequal, hyaline in KOH, yellow in Melzer's, some with a slight central constriction (Fig. 12). Pleurocystidia 52 - 65 x 13 - 17 µm (D^m = 58.5 x 13 µm), thin-walled, broadly fusoid ventricose, hyaline in KOH, yellow in Melzer's, rare (Fig. 13); cheilocystidia 23.5 - 37.5 x 5 - 9 (-11.5) µm (D^m = 32.5 x 8 µm), thin-walled, equal to subventricose to clavate, hyaline in KOH, yellow in Melzer's, in chains of 2 - 3 cells (Fig. 14); caulocystidia (19.5-) 26 - 35 (-39) x 5 - 8 µm (D^m = 30 x 6.5 µm), thin-walled, clavate, yellow in KOH, gold in Melzer's, some with a thick refractile apex. Spores 13 - 18 (-21) x 4 - 6.5 µm (D^m = 17 x 5 um; E = 2.8 - 3.7; E^m = 3.2), fusoid,inequilateral by a distinct suprahilar depression and adaxial swelling, pale ochraceous green in KOH, pale yellow-rust (sub dextrinoid) in Melzer's (Fig. 15); surface smooth (Fig. 21), walls continuous, surrounded by a hyaline membrane.

Observations. The violet pallid color of the hymenophore is characteristic of this taxon. Since it belongs in the genus Mucilopilus, the following new combination is proposed.
Mucilopilus violaceiporus (Stevenson) Wolfe, comb. nov.
Basionym: Boletellus violaceiporus Stevenson. 1962. Kew Bull. 15(3): 384.

Type specimen (holotype): K - "Herb. Hort. Bot. Reg. Kew; Maitai, New Zealand; G.B.C. 1060; 29.4.1956." [!]