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Page number:926 
Remarks (internal):This olive-colored Phylloporus is known from sandy soils in western USA and is not as common as P. rhodoxanthus is in the east. Phylloporus arenicola does not turn blue when injured; its pileus cuticle turns violet-fuscous or reddish when exposed to NH4, and the basidiome dimensions are generally smaller than those observed for P. rhodoxanthus. The forests with which each taxon is associated also differ. Phylloporus arenicola is associated with Pinus (Pinus contorta in the type location, Tillamook County, Oregon), while the hosts for P. rhodoxanthus are species of Quercus 
Description type:Non-original description 
Description:Phylloporus arenicola A.H. Sm. & Trappe, Mycologia 64:1138-1153. 1972. Figs. 2, 19
Pileus 1.5-4.5 cm broad, at first plane, with age convex or depressed, dry, even; disk subtomentose, at first olive, then olive-ocher; margin when young olive, then olive-brown or olive-ocher; surface velutinous, becoming subtomentose or tomentose, with NH4 red or purple. Flesh pale yellow, staining absent; odor absent; flavor mild; with FeSO4 olivaceous. Hymenophore lamellate, adnexed. Lamellae subdistant, simple, when young bright yellow, with age mustard yellow, staining absent; edges even. Stipe 4-6 cm long, 6-8 mm wide, tapering downward, curved or sinuate, dry; upper half when young pruinose, with age subpruinose; lower half when young pruinose, dull yellow; pruina on upper half when young brown; base bright yellow, not staining; interior solid; yellow, flesh at base when young bright yellow, not staining. Basal mycelium yellow. Fleeting-amyloid reaction weakly positive.
Basidiospores 9-12 µm long, 4-5 µm wide, mean Q = 2.3, ovoid or lacrymoid, smooth, weakly dextrinoid, in KOH olive-hyaline. Basidia 38-60 µm long, 9-13 µm wide, clavate, hyaline, four-sterigmate. Hymenial cystidia 52-86 µm long, 9-16 µm wide, numerous on sides and edges of lamellae, thin-walled, hyaline, subfusoid or fusoid-ventricose, encrusting pigment absent. Hymenophoral trama bilateral; hyphae cylindrical, 9-13 µm wide, hyaline. Pileipellis hyphae a trichodermium, in KOH pale yellow or hyaline, inamyloid; cylindrical or elongated, encrusted with pigment (in Melzer's), thin-walled, granular content absent. Pileus trama hyphae hyaline, smooth. Stipitipellis hyphae vertically oriented, parallel, giving rise to versiform caulocystidia (rare), 44.8-45.5 µm long, 15.4-16.1 µm wide, cylindrical, hyaline. Stipe trama hyphae parallel, cylindrical, hyaline, somewhat dextrinoid. Clamp connections absent.
Mycorrhizal host: Pinus.
Distribution: Collections of P. arenicola are from Washington, Oregon and northern California, USA.
Taxon name: