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Page number:517 
Remarks (public):The distinctive ventricose cystidioles 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. The concept of P. robustus presented here is based on pileate specimens on living oaks in Europe. P. punctatus basidiocarps are resupinate and occur on dead hardwoods and conifers. 
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.
Setae absent or occasional in some specimens, thick-walled, subulate to ventricose,
thin- to thick-walled, 18-50 x 5-8 µm.
Cystidioles 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, 6-8.5 x 5.5-7 µm.
Type of rot. White rot of heartwood of living Quercus spp.
Cultural characteristics. See Campbell 1938; Davidson et al. 1942; and Nobles 1948, 1958, 1965; David et al. 1982.
Sexuality. Homothallic (Fischer 1987).
Substrata. Preferably on Quercus and following this genus throughout Europe, but also recorded from Arbutus, Aesculus, Castanea, Citrus, Corylus, Cratageus, Eucalyptus, Fagus, Ficus, Fraxinus, Laurus, Ostrya, Pistacia, Platanus, Populus, Robinia, Quercus, Salix, Syringa Tamarix and Ulmus.
Distribution. Follows Quercus to southern Fennoscandia, but very rare in this area. Cosmopolitan species.
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