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Page number:77 
Description type:Non-original description 
Description:PHELLINUS ROBUSTUS (Karst.) Bourd. & Galz., Hym. France, p. 616. 1928.
Fames robustus 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 incrusted 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.
Contextual hyphae of two types, some brown in KOH, thick-walled, rarely branched, rarely simple-septate, 2.5-4 µm in diam; others hyaline, thin-walled, simple-septate, 2-2.5 µm in diam., inconspicuous; tramal hyphae similar.
Setae lacking or occasional in some specimens, subulate to ventricose, thin- to thick-walled, 18-37 x 5-8 µm.
Cystidia usually abundant in hymenium, hyaline, thin-walled, ventricose with narrow, tapered apex, 15-60 µm long and 5-7 µm in diam at the base, narrow apical part 1.5-2 µm in diam.
Basidia broadly ellipsoid, 4-sterigmate, 11-12 x 8-9.5 µm. 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 hardwoods. On oaks in the Southwest the basidiocarps develop near the base of living trees and are associated with a butt and root rot.
Cultural characteristics - See Campbell (1938), Davidson et al. (1942) and Nobles (1948, 1958, 1965).
Substrata - Prunus, Quercus. Distribution - AZ, CA, ID, NM. Voucher specimens - RLG 10827; RLG 10782 (ARIZ).
Remarks - The distinctive ventricose cystidia with elongated slender apices are apparently characteristic of all the species in the Phellinus robustus complex. These rarely differentiate into setae but in most specimens setae are apparently absent. The concept of P. robustus presented here is based on pileate specimens on living oaks in the Southwest. Phellinus punctatus basidiocarps are resupinate and occur on dead hardwoods and conifers. Phellinus hartigii has reflexed basidiocarps on living conifers. Phellinus sonorae has resupinate to slightly effused basidiocarps at the base of Dodonaea viscosa.
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