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Page number:54 
Description type:Non-original description 
Description:Basionym: Polyporus peckianus Cooke, Trans. Proc. Bot. Soc. Edinburgh 13: 148 (1879).
Syn. P. flavidus Peck 1874, not P. flavidus Berk. 1852. Type in NYS (not studied).
Pileus slightly depressed or infundibuliform, circular or nearly so, 4-5 cm in diameter. Margin acute, in exsiccates inrolled and darker brown (up to 10G7) than other parts of cap. Cap surface light yellowish-olivaceous, 10F1 to 10F3, only very slightly glossy, without distinct zones and smooth.
Flesh 2 mm thick or less. When dried fragile, light yellow, 10D1, 10F1. Tubes 1 mm or shorter, fragile. Pores ca. 4.5-5.5 per mm, openings 0.1-0.3 mm in diameter, seldom wider, angular and regular. Mouths of pores slightly dentate, somewhat ciliate, bright light yellow (9J1) when young, paler (9F4, 9J4) when mature and with brownish spots where touched.
Stipe 3-5 cm long, 0.5-1 cm in diameter at thinnest portion, 0.8-1.5 cm at tuberculate base and with whitish mycelial strands. Surface and flesh of stipe pale yellowish, 9C1, flesh 10B1. Stipe sometimes branched (Overholts 1953).
Spores 3.6-3.8 (-4.0) x 2.5-2.8 (-3.0) µm, single, elliptical, obtuse-based, with distinctly applanated supra-apicular region, thin-walled, smooth, hyaline and with one round (or collapsed) guttule about 2. µm in diameter. No iodine reactions. Apiculus smaller than that of A. syringae. Basidia clavate, about 14 x 5 µm, with four 3-3.5 µm long, very thin sterigmata. No cystidia.
Hyphal system monomitic. Hyphae in all parts of sporophore with cross walls and clamps, not dextrinoid. Hyphae of hymenial trama 2.9-3.5 µm in diameter, thin-walled, subparallel, of even thickness. Subhymenium and hymenial trama sometimes showing delayed amyloid reaction similar to that in A. syringae. Oleiferous cells of-ten extending into upper parts of hymenial trama.
Context hyphae slightly inflated, 5-8(-10) µm in diameter, thin-walled, not amyloid. Walls often somewhat undulate. Contents of hyphae homogeneous or often with yellowish granules. Oleiferous hyphae 4.5-6 µm thick, intensely yellow, straight and fragile. Cells of upper surface not differentiated.
Hyphae in lower parts of stipe near surface 4-5 µm thick, straight, loosely packed, their walls thin or up to 1.5 µm thick. In inner parts of stipe inflated, 5-8(-17) µm in diameter, closely packed, not amyloid, their walls seldom thin, usually 2-3.5 µm thick. Granulose and oleiferous hyphae occurring, but not very abundantly.
The species grows on the ground in connection with the wood of deciduous trees: Fagus (Overholts 1953), Tilia (LOWE 1934) and Acer (specimen studied). So far it is known only from North America.
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