Phylloporus centroamericanus Singer & Gómez, Brenesia 22: 169. 1984.
Pileus 2–3 cm broad, at first convex, with age plane, dry; disc even, at first brown, then tan; margin even, when young brown, then tan; surface subtomentose, becoming finely areolate; maculose color spots absent; with NH4 blue. Flesh 5–9 mm thick, white, staining absent or blue green (rare); odor mild; taste mild. Hymenophore lamellate, decurrent. Lamellae 1–5.5 mm wide, subdistant to close, not anastamosing, later rather strongly intervenose, tridymous, when young bright lemon or sulpher yellow, with age brown, staining blue; edges even. Stipe 3.5–4 cm long, 5–8 mm wide, tapering downwards, sometimes eccentric or curved, dry; upper half when young coarsely subpruinose to finely subscabrous, white, with age coarsely subpruinose to finely subscabrous, white; lower half when young finely subscabrous to subpruinose (coarse), white or yellow (near the base), with age coarsely subpruinose to finely subscabrous, white or yellow (near the base); scabers on upper half when young brown, with age brown, on lower half when young brown, with age brown; base white, staining not present. Stipe interior solid; flesh above when young white (slightly pinkish brown in midportion), with age white (slightly pinkish brown in midportion), staining not present; flesh at base when young white, with age white, staining not present. Basal mycelium white.
Basidiospores olive brown, 8–16 µm long, 4–5.5 µm wide, mean Q = 2.7, smooth, fusoid, inamyloid, with KOH light brown melleous. Basidia 28–38 µm long, 6.2–8 µm wide, clavate, hyaline, 4 -sterigmate. Hymenial cystidia 35–138 µm long, 10–25 µm wide, more common towards the edge of lamellae, mostly thick walled, hyaline, often clavate to ventricose to fusoid to fusoid mucronate to utriform, gelatinization absent, encrusting pigment present. Hymenophoral trama hyphae bilateral (phylloporoid), hyaline, in KOH yellow, inamyloid. Pileipellis hyphae hymeniform and forming a palisade, in KOH yellow (exuding pigment), inamyloid; elements 5–24 µm wide, elongated or subisodiametric or cellular, encrusted with pigment, thin walled, not gelatinized. Intercalary cells isodiametric to subisodiametric, 15–32 µm long, 12–24 µm wide. Pileus trama interwoven, hyaline, inamyloid, smooth, thin walled. Stipitipellis hyphae vertically oriented, parallel, giving rise to versiform caulocystidia or dermatocystidia or clusters of caulocystidia, 40–80 µm long, 10–20 µm wide, clavate to ventricose or fusoid, with incrusting pigment present (hyaline to melleous). Stipe trama hyphae parallel to subparallel, cylindric, hyaline, inamyloid. Clamp connections absent.
Mycorrhizal host: Quercus.
This species is characterized by the red brown pileus, white mycelium at the stipe base, lack of isodiametric cells in the pileipellis, and thick walled and encrusted hymenial cystidia. Also, the lamellae are rarely cyanescent. It is widespread in oak forests of the Cordillera Talamanca in Costa Rica.
Desc0012.
Cite this publication as: Halling, R. E., G. M. Mueller, and M. J. Dallwitz. 1998 onwards. Leccinum and Phylloporus in Costa Rica: Descriptions, Illustrations, Identification, and Information Retrieval. Version: 13 Decmber 2006. http://www.nybg.org/bsci/res/hall/deltaindex.html. Dallwitz (1980) and Dallwitz, Paine and Zurcher (1993 onwards, 1998) should also be cited (see References).
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