Phylum：Basidiomycota　>>　Class： Basidiomycetes　>>　 Order： Boletales 
   
 
　BCRC Number： NO BCRC Number!  
   
　Scientific Name： Strobilomyces nigricans
 
   
   
　Author：

Strobilomyces nigricans Berk., Hook. J. Bot. & Kew Gdn Misc. 4: 139. 1852.
   
 
 
 
 
　Description： Pileus 4-5 cm broad, greyish brown, with acute warts that base smaller than 2 × 1 mm, rigid, confined to the disk; the marginal half merely appressed, angular, dull black, squamulose, margin appendiculate. Context 4-7 mm thick, color gray to drab gray. Tubes 7-10 mm long, gray near drab. Pores 3-6 mm wide, circular, whitish at first then greyish with age, rubescent when bruised. Stipe 5-8 cm long, 6-12 mm broad, tapering upwards or equal, surface with grey, thick, woolly annular zone near the apex and an elongate reticulum of black fibers below. Spore print black. Spores 14-17 × 12-14.5 μm, globose or subglobose, adaxially applanate, exosporial ornamentation consisting of a complete reticulum with a mesh 2-3.5 μm diam., 1-3 μm deep, drab in KOH. Basidia 51-67 × 17-19 μm, clavate, sterigmata four, 5-8 μm long. Pleurocystidia 61-68 × 16-19 μm, numerous, fusoid to ventricose, often with an elongate neck that diminishing easily with age. Hymenophoral trama bilateral of the boletus-type. Clamp connections absent.
 
 
 
 
 
　Specimens：

Taiwan, Nantou: Shanlihsi, alt. 1750 m, 8 Jun 1994, Chen CM 1146.
 
 
 
　Habitat： Solitary to scattered in the broad-leaved forest.
 
 
 
　Distribution：

Taiwan, China (Yunnan), Japan, Indonesia, North America.
 
 
 
　References：

Pegler, D.N. 1981; Chen, CM et al. 1998.
   
   
   
　Provided：

C. M. Chen
 
 
　Note： The spores of genus Strobilomyces have a very strongly developed exosporial orna-mentation, whose shape is reticulate with a large or small mesh to verrucose or echinate. Of the species in the genus, S. nigricans ( Fig.19) has the largest ornamentation with a complete reticulum, 1-3 μm deep, almost doubling the overall volume. Its larger spores are distin-guishable from those of S. mollis by having a similar reticulum, only 1-2 μm deep (Pegler, 1981).