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Page number:929 
Remarks (internal):The ectomycorrhizal association along with the white basal mycelium are good field characters to identify this taxon. Singer and Gómez (1984) compared the Argentinean specimen to collections from Costa Rica and suggested that the latter were larger, older collections, with tomentose stipes and that the basidiomes collected in Argentina were still young and therefore glabrous. The collection from Panama agrees with the Costa Rican specimen described as possessing a larger basidiome with a tomentose stipe. The question posed by Singer on whether the collections from Costa Rica and Panama are a different species or a Central American race of P. caballeroi cannot be answered until more material is studied. The Bolivian material also agrees with the description from the Costa Rican specimen. The type specimen at F has been annotated with the correct number cited in the protolog (T5150).  
Description type:Non-original description 
Description:Phylloporus caballeroi Singer, Beih. Sydowia 7:101. 1973. Fig. 6
Pileus 1.7-4.5 cm broad, at first pulvinate to planoconvex, with age frequently subumbonate to umbonate, dry; disk uneven or smooth, at first brown to dark brown, then brown to dark reddish brown; margin smooth, cinnamon brown; surface tomentose to velutinous (often fracturing into small brown fibrils on yellowish ground), often becoming glabrous or tomentose to velutinous, 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 anastomosing, sometimes intervenose, when young yellow, staining absent or light blue green. Stipe 2.4-4.6 cm long, 2.5-7 mm wide, equal or tapering downward, dry; upper half when young glabrous to subglabrous, pallid, with age yellow pruinose to fibrillose or subreticulate, ground-yellow; lower half when young subglabrous to glabrous, pallid, with age fibrillose to punctate, brown to yellow; interior solid; flesh white or whitish yellow, not staining or staining rusty ochraceous. Basal mycelium white. Fleeting-amyloid reaction positive.
Basidiospores brownish olive in mass, (9-)10-12 (-12.7) µm long, 4-5(-6) µm wide, mean Q = 2.21, mostly subfusoid or subellipsoid to subglobose (few), smooth, dextrinoid. 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 constrictions) or utriform, encrusting pigment absent. Hymenophoral trama bilateral. 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. Intercalary cells subisodiametric, 10-14 µm long, 8.5-10 µm wide. Pileus trama interwoven, hyphae hyaline, inamyloid, smooth, thin-walled. Stipitipellis hyphae vertically oriented, parallel or interwoven, giving rise to dermatocystidia, 25-42 µm long, 5-10 µm wide, mostly clavate, hyaline, with encrusting pigment present (pale melleous and granular). Clamp connections absent.
Mycorrhizal host: Alnus acuminata.
Distribution: First described from collections gathered in northern Argentina, the species is widespread under montane Neotropical alder, A. acuminata, from that country north to at least Costa Rica. Collections examined in this work are from Argentina, Bolivia and Panama.
Material examined: Argentina. Jujuy: Lagunas de Yala, 2400 m, 14 Feb 1966, Singer T5051 (Holotype: F), T4062 (Paratype: F).
 
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