Phylum:Basidiomycota >> Class: Basidiomycetes >>  Order: Boletales 
 BCRC Number NO BCRC Number!  
 Scientific Name: Boletellus projectellus

Boletus projectellus Murrill, Mycologia 30: 525. 1938.

Basionym: Ceriomyces projectellus Murrill, Mycologia 30: 524. 1938.

Boletellus projectellus (Murrill) Singer, Farlowia 2: 129. 1945.

 Description: Pileus 4-8 cm broad, convex becoming plane, margin free, projecting and hanging straight down, surface subtomentose, soon areolate-squamulose; color in young rather light gray-brown with a tint of rose, becoming darker with age. Context thick, up to 1.5 cm near the stipe, pale rose color throughout, fading with age to more yellowish, color red around larval tunnels. When cut becoming flushed vinaceous near the cuticle but elsewhere slowly changing to yellow-brown, occasionally colored around larval tunnels. Tubes pale olivaceous, 0.8-1.2 cm long, depressed around the stipe, not staining when cut. Pores 0.5-1 mm broad, circular, color pale olive when young, finally dark brownish olive. Stipe 7-12 cm long, 1-2 cm thick, tapering upward or equal, surface concolorous with pilus, minutely granular, dingy vinaceous-buff to cinnamon-buff, unpolished and both coarsely and shallowly reticulate nearly to base. Spore print olivaceous brown. Spores 20-23 × 8-9 μm , ovate to boat-shaped in face view, in profile inequilateral and with a prominent suprahilar depression, smooth, lacking a distinct apical pore, golden yellow and wall measuring 1-1.5 μm thick in KOH. Basidia 27-35 × 14-17 μm, clavate, yellowish in KOH, fading to hyaline, sterigmata four, 4-6 μm long. Pleurocystidia 58-95 × 15-24 μm, ventricose to subobclavate, smooth, hyaline, readily collapsing. Tube trama parallel to subparallel, the outer hyphae diverging slightly to the subhymenium, hyphae 8-10 μm broad. Clamp connection absent.

Taiwan, Nantou: Shanlihsi, alt. 1750 m, 3 June 1992, Huang HW 267.

 Habitat: Solitary in the broad-leaved forest.

Taiwan, North America.


Chen, CM et al. 1998.


C. M. Chen

 Note: This species has smooth spores (Fig.13), nevertheless, it has been classified in the Strobilomycetaceae because of its greatly elongated spores and other characteristics of the basidiocarp, that suggest its close relationship to rough-spored species of the family (Grand and Moore, 1971). The margin of its pileus is sterile for which the species was named (Murrill, 1938). The Melzer's reaction on the spores is much like that of Boletus amylosporus (Smith and Thiers, 1971). It differs from Boletus badius in wide sterile margin, lack of viscidity, much larger spores and somewhat different color.