Phylum：Basidiomycota　>>　Class： Basidiomycetes　>>　 Order： Boletales 
   
 
　BCRC Number： NO BCRC Number!  
   
　Scientific Name： Xerocomus alutaceus
 
   
   
　Author：

Basionym: Boletus alutaceus Morgan in Peck, Bull. N. Y. State Mus. 2:109. 1889.

Xerocomus alutaceus (Morgan in Peck) Dick & Snell, Mycologia 53: 228. 1961.
   
 
 
 
 
　Description： Pileus 5-10 cm broad, broadly convex to nearly plane, surface siccous and subtomentose, viscid when wet, color dull yellow-brown at first to pale tan with a reddish tint. Context white with a reflection of pink near the tubes, 6-14 mm thick at the stipe, unchanging when bruised. Context hyphae of pileus 8-15 um, orange-brown in Melzer,s reagent. Tubes 4-12 mm long, whitish when young, becoming pale olivaceous in age, depressed around the stipe, not changing to blue when bruised. Pores 1-1.5 mm broad, olivaceous pallid but slowly brownish in age. Stipe 6-8 cm long, 1-2 cm thick, straight or curved slightly, subequal, solid, context changing to vinaceous-buff when cut, surface yellow-brown, with lines from extensions of the tubes. Spore print yellow-brown. Spores 12-15.5 × 5-6 um, suboblong in face view, slightly inequilateral in profile, smooth. Basidia 45-57 × 12-15 um, clavate, four sterigmata, 5-6 um long. Pleurocystidia 60-85 × 12-14 um, fusoid-ventricose with obtuse apex, context often ding yellow as revived in KOH. Tube trama of hyaline gelatinous hyphae somewhat divergent to the subhymenium.
 
 
 
 
 
　Specimens：

Taiwan, Taichung: Paikoutashan, alt. 1000 m, 6 Jul 1995, Huang HW. 1324.
 
 
 
　Habitat： Solitary under Castanopsis carlesii (Hemsl.) Hay.
 
 
 
　Distribution：

Taiwan, China (Sichuan, Guangxi, Yunnan, Yhainan Island), North America.
 
 
 
　References：

Chen, CM et al. 1997.
   
   
   
　Provided：

C. M. Chen
 
 
　Note： This species is easily confused with Boletus pallidus Frost, but it does not stain blue and is not whitish when young like the latter. Furthermore, the hyphae of the context react in Melzer,s reagent similar to those of Boletus roxanae Frost.