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Page number:203 
Remarks (internal):The distinctive ventricose cystidiols with elongated slender apices are apparently characteristic of all the species in the Phellinus robustus complex. These rarely differenti­ate­ into setae and in most specimens setae are apparently absent.  
Description type:Non-original description 
Description:Phellinus robustus (P. Karst.) Bourdot & Galzin,
Hym. France, p. 616, 1928. - Fomes robustus P. Karst., Finl. Basidsv., p. 467, 1889.
Basidiocarps perennial, sessile or effused-reflexed, pilei ungulate to applanate, up to 12 x 20 x 11 cm; upper surface brown to blackish, becoming encrusted and rimose, usually sulcate, glabrous; margin concolorous or yellowish brown at first, then faintly tomentose, rounded, fertile below; pore surface yellowi­sh- or grayish-brown, the pores circular, 7-9 per mm, with thick, entire dissepiments; context shining yellowish brown, zonate, hard, woody, up to 3 cm thick, core with white radial streaks present near point of attachment; tube layers distinct, light brownish, becoming whitish within, woody, each layer up to 3 mm thick.
Hyphal system dimitic; contextual skeletal hyphae brown in KOH, thick-walled, rarely branched, rarely simple-septate, 2.5-5 µm in diam; contextual generative hyphae hyaline, thin-walled, simple-septate, 2.5-5 µm in diam, inconspicuous; tramal hyphae similar.
Hymenial setae absent or occasional in some specimens, thick-walled, subulate to ventricose, thin- to thick-walled, 18-50 x 5-8 µm.
Cystidiols usually abundant in hymenium, hyaline, thin-walled, ventricose with narrow, tapered apex, 25-50 µm long and 5-8 µm in diam at the base, narrow apical part 1.5-2 µm in diam.
Basidia broadly ellipsoid, 4-sterigmate, 12-15 x 8-9.5 µm, simple-septate at the base.
Basidiospores subglobose, hyaline, smooth, thick-walled at maturity, dextrinoid in Melzer's reagent, and 6-8.5 x 5.5-7 µm.
Substrata. Preferably on Quercus, but also recorded from many other hosts.
Distribution. Cosmopolitan species and found in Guyana, Costa Rica, and further to the north where oak occur.
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