Phylum：Basidiomycota　>>　Class： Basidiomycetes　>>　 Order： Boletales 
   
 
　BCRC Number： NO BCRC Number!  
   
　Scientific Name： Pulveroboletus ravenelii
 
   
   
　Author：

Pulveroboletus ravenelii (Berk.et Curt.) Murill, Mycologia 1: 9. 1909.

Basionym: Boletus ravenelii Berk. et Curt., Ann. Mag. Nat. Hist.Ⅱ. 12: 429. 1853.
   
 
 
 
 
　Description： Pileus 3-8 cm broad, convex, becoming nearly plane, surface glabrous, dry, dull, areolate in age, margin entire, incurved, often with remnants of veil, color bright yellow when young, becoming ochre to yellow brown in age, sometimes brownish red, context pale yellow, becoming grayish upon cutting or exposure. Tubes 4-10 mm deep, adnate, depressed around the stipe, color at first yellow then light brownish olive, sometimes olive yellow. Pores 0.5-1 mm broad, concolorous with tube, round or subangular, blue when bruised, then brown, finally dark brown. Stipe 6-8.5 cm long, 7-12 mm thick, mostly equal, annulate, pulverulence from universal veil over lower half. Spore print olive-brown. Spores 11-14 × 4.5-5.5 μm, shape narrowly boat-shaped in face view, narrowly inequilateral in profile view, thin-walled, smooth, pallid-ochraceous in KOH solution, ochre brown in Melzer's reagent. Basidia 40-50 × 11-14 μm, clavate, thin-walled, sterigmata two or four, 5-6 μm long, hyaline in KOH, pale yellowish in Melzer's reagent. Pleurocystidia 30-45 × 7-12μm, fusoid-ventricose, neck often curved. Pileal cuticle an undifferentiated pellicle of tangled interwoven hyphae, 3-6 μm wide. Clamp connections absent. Tube trama gelatinous and of divergent hyphae.
 
 
 
 
 
　Specimens：

Taiwan, Nantou: Sun Moon Lake, alt. 800m, 23 Aug 23 1994, Chen CM 713.
 
 
 
　Habitat： Scattered under Myrsine sequinii Levl.
 
 
 
　Distribution：

Taiwan, China, Japan, Malaysia, North America.
 
 
 
　References：

Chen, CM et al. 1998.
   
   
   
　Provided：

C. M. Chen
 
 
　Note： The bright yellow sporocarp with the powdery membranous veil that leaves an annulus on the stipe are key characters for the taxon. The hyphal components of veil are interwoven, smooth-walled, yellow, and branched. The hyphae fade quickly in KOH, but bunches of greenish crystals and amorphous debris often precipitate in KOH solution. Its surface is not a true pulverulence caused by loose sphaerocysts.