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

Xerocomus nigromaculatus Hongo, Journ. Jap. Bot. Vol. 41:170.

 Description: Pileus 2-7 cm broad, convex to plane, margin incurved at first, surface siccous, with tomen-tose-granulose arranged to look alike rimose-areolate, color pallid argillaceous, nigrescent in age. Context soft, whitish to pale yellow, cyanoscent then rufescent immediately when bruised, nigricant eventually. Stipe 2-5 cm long, 4-10 mm broad, subequal to base enlarged with whitish mycelium around base, surface concolorous with pileus, fibrillose-striate to nearly laevigate, context solid and snap easily, rufescent when cut. Tubes 5-12 mm long, adnato-subdecurrent, color flavous, caerulescent when cut. Pores 0.7-2 mm broad, rather large, angular, color flavous and cyanoscent immediately when bruised. Spore print oliva-ceo-brown. Spores 9-15 × 4-5.5 μm, fusiform-ellipsoid, smooth. Basidia 30-35 × 9-11 μm, clavate, sterigmata four, 5-7 μm long. Pleurocystidia versiform, some 63-92 × 16-23 μm, subcylindric to broadly fusifom-ventricose; the others 69-88 × 19-37 μm, ventricose-rostrate, abundant, hyaline in KOH but dingy ochraceous in NH4OH. Clamp connection absent.

Taiwan, Miaoli: Jenshan, alt. 2300m, 13 Sept. 1996, Huang HW. 1682.

 Habitat: Scattered under Cryptomeria forest.

Taiwan, Japan.


Chen, CM et al. 1997.


C. M. Chen

 Note: It can be easily recognized by the black-spotted and argillaceous pileus. Particularly, its flesh being rufescent then nigrescent when bruised, is a unique character in the genus of Xerocomus.