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Page number:76 
Description type:Non-original description 
Description:PHELLINUS ROBINEAE (Murr.) A. Ames, Ann. Mycol. 11(3):246. 1913. Pyropolyporus robineae Murr., Bull. Torrey Bot. Club 30:114. 1903. Fomes robineae (Murr.) Sacc. et D. Sacc., Syll. Fung. 17:117. 1905. Basidiocarps perennial, sessile, applanate to ungulate, up to 30 cm wide; upper surface at first yellowish brown, finely tomentose, azonate, with age becoming black, deeply rimose, often appearing scaly, glabrous; margin at first yellowish brown, finely tomentose, in older specimens concolorous with the blackened, rimose upper surface, pore surface yellowish to reddish brown, the pores circular, 7-8 per mm, with thick, entire dissepiments; context tissue light reddish brown, azonate, woody, up to 2.5 cm thick; tube layers concolorous and continuous with the context, distinctly stratified, woody, each layer up to 3 mm thick.
Contextual hyphae brown in KOH solution, thin- to thick-walled, with rare branching, simple-septate, 2.5-5.5 µm in diam; tramal hyphae similar, 2.5-3.5 µm in diam.
Setae or other sterile hymenial structures lacking. Basidia broadly clavate, 4-sterigmate, 10-12 x 5.5-6 µm. Basidiospores ovoid to subglobose, appearing flattened on one side, reddish-brown, smooth, negative in Melzer's reagent, 5-6 x 4.5-5 µm. Type of rot - White rot of heartwood of living black locust.
Cultural characteristics - See Campbell (1938) and Nobles (1948, 1958, 1965).
Substrata - Robinia neomexicana, Robinia pseudoacacia. Distribution - AZ, CA, ID, NM.
Voucher specimens - RLG 7049; ERC 71-42 (ARIZ).
Remarks - Phellinus robineae is apparently present in the Southwest wherever Robinia neomexicana grows. Basidiocarps of P. robineae are similar to those of Phellinus badius but have smaller pores and tend to be more applanate than those of P. badius.
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