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Family: BoletaceaeGenus: Xerocomus
Cap: 20-30mm in diameter, somewhat convex to hemispherical, becoming plano-convex, tomentose to smooth, highly variable in colour, reddish-yellow to dark brown, mostly a rich red brown sometimes showing lighter shades at the outer edge. Sometimes slightly cracked towards margin, cracks never show colour in context beneath. Tubes: up to 18mm in length, bright pale yellow to dirty straw yellow, no colour change on cutting or bruising. Pores: same colour as tubes, red spotted with age, unchanging when cut or bruised, roundish when young, later angular especially toward the outer edge. Stem: variable in size and shape 22-70 (130) x 7-33 mm, cylindrical to sub-clavate always tapering at the very base, often deeply rooting. Stem apex often with a narrow band of yellow bearing the decurrent tubes that extend into an easily observed crude reddish-brown reticulum over a light yellow background, buff towards base. The stipitipellis often splits and peels both upwards and downwards as the basidioma matures. Context: firm, white to light yellow, changing to reddish-greyish rose in the stem base when cut. Mycelium: off white to pale yellow, never golden yellow, pale yellow in dried specimens. Spores: (9) 12 (18.5) x (4) 5 (5.5) μm, Q 2.1-2.5, average size 12 x 5 μm, sub-fusiform to broadly subfusiform in side view, ellipsoid to broadly ellipsoid in face view, smooth. Spore print: olive-brown.