Phylloporus caballeroi Singer, Beih. Sydowia, 7:101. 1973.
Pileus 1.7–4.5 cm broad, at first pulvinate to plano-convex, with age frequently subumbonate to umbonate, dry; disc uneven or smooth, at first brown to dark brown, then brown to dark reddish brown; margin smooth, when young cinnamon brown, then remaining cinnamon brown; surface tomentose to velutinous (often breaking up into very small floccons of brown fibrils on more yellowish ground), becoming glabrous (often) or tomentose to velutinous; maculose color spots absent; with NH4 strongly blue. Flesh white or yellowish white, staining absent; odor absent or fruity. Hymenophore lamellate, subdecurrent to sinuate to adnate. Lamellae subdistant to close, not anastamosing, in places somewhat to distinctly intervenose, tridymous or tetradymous, when young yellow, staining almost absent or blue green. Stipe 2.4–4.6 cm long, 2.5–7 mm wide, equal or tapering downwards, not radicating, dry; upper half when young glabrous to subglabrous, pallid (with a cinnamon flush), with age yellow pruinose to fibrillose to punctate (brown) or subreticulate, ground color yellow; lower half when young subglabrous to glabrous, pallid (with a cinnamon flush), with age fibrillose to punctate, brown to yellow. Stipe interior solid (when young) or stuffed (with age); flesh above when young white or whitish yellow, with age white or whitish yellow, staining not present or rusty-ochraceous; flesh at base when young white to whitish yellow, with age white to whitish yellow, staining not present or rusty-ochraceous. Basal mycelium white.
Basidiospores brownish olive, (9–)10–12(–12.7) µm long, 4–5(–6) µm wide, mean Q = 2.21, smooth, mostly fusoid or ellipsoid to oblong (few), inamyloid. Basidia (30.5–)32–37(–40) µm long, (7.5–)8.5–9.5(–11) µm wide, clavate, hyaline, (2–)4 -sterigmate. Hymenial cystidia 40–105 µm long, 7.5–14 µm wide, thin walled, hyaline, ampullaceous or fusoid (with obtuse tip but often with constriction(s)) or utriform, encrusting pigment absent. Hymenophoral trama hyphae bilateral (phylloporoid), inamyloid. Pileipellis hyphae a trichodermium and forming a palisade, in KOH yellow or brownish; elements 6–18.5 µm wide, elongated, smooth, thin walled, granular content absent, not gelatinized. Intercalary cells subisodiametric, 10–14 µm long, 8.5–10 µm wide. Pileus trama interwoven, hyaline, inamyloid, smooth, thin walled. Stipitipellis hyphae vertically oriented, parallel or interwoven (with age granular incrustations), giving rise to dermatocystidia, 25–42 µm long, 5–10 µm wide, mostly clavate, hyaline, with incrusting pigment present (pale melleous and granular). Clamp connections absent.
Mycorrhizal host: Alnus (acuminata, above 2000 m altitude).
First described from collections gathered under Alnus acuminata in northern Argentina, the species is widespread under the montane Neotropical alder from that country north to at least Costa Rica. The ectomycorrhizal association along with the white basal mycelium are good field characters.
Desc0011.
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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