Phylum:Basidiomycota >> Class: Basidiomycetes >>  Order: Boletales 
 BCRC Number NO BCRC Number!  
 Scientific Name: Fuscoboletinus paluster

Basionym:Boletus paluster Peck, Ann. Rept. N. Y. State Cab. 23: 132. 1872.

Fuscoboletinus paluster (Peck) Pomerleau, Mycologia 56: 708. 1964.

Boletinellus paluster (Peck) Murr., Mycologia 1: 8. 1909.

Boletinus paluster (Peck) Peck, Bull. N. Y. State Mus. 298: 78. 1889.

 Description: Pileus 0.8-7 cm broad, irregularly umbonate when young, expanding to convex- umbonate or nearly plane when aged; surface floccose-tomentose covering which breaks up into fibrillose squamules; margin entire, thin, incurved; color wine red to deep red; context yellow, red under cutis, soft, unchanging when bruised; taste mildly acid, odor not distinctive. Tubes shallow (about 2 mm deep), decurrent, yellow and finally becoming dingy ochraceous, unchanging when bruised. Pores large, angular in radial arrangement or sublamellate with crossveins. Stipe 3-5 cm long, 7-10 mm thick, equal to tapering downward, solid, surface finely pruinose; concolorous with pileus, yellow band at apex covered with decurrent reticulation, base yellow mycelioid; context yellow to pallid, soft, unchanging when bruised. Spore deposit dark purplish brown when moist, pinkish brown when air-dried. Spores 9-11.5×3.5-4.5 μm, inequilateral, narrow, slight suprahilar depression in profile, oblong in face view, smooth, hyaline in KOH, yellow in Melzer's. Basidia 29-35 × 7-8 μm, elongate-clavate to sub-cylindrical, thin-walled, 2 or 4-spored, sterigmata 5-7 μm long, hyaline in KOH, pale yellow in Melzer's. Pleurocystidia 55-104 × 6.5-11 μm, subcylindric, apices rounded, thin-walled, hyaline in KOH, pale yellow in Melzer's. Cheilocystidia 20-80×6-11 μm, cylindric, clavate to subventrcose, thin-walled, hyaline in KOH, pale yellow in Melzer's. Caulocystidia at apex of stipe 25-52×8-10 μm, subcylindric, clavate to clavate-mucronate, thin-walled, hyaline in KOH, at the base 25-40 × 6-9 μm, mostly clavate, septate, terminal element often obclavate, thin-walle, hyaline in KOH. Tube trama interwoven type, hyaline in KOH, nonamyloid, basal cell with clamp connections but difficult to find. Pileal cuticle a non-gelatinous trichodermium, end cells 7-12 μm thick, pale yellow in KOH, red to red-brown in Melzer's.

Taiwan, Taitung: Shiang-Yang, alt. 2,312 m, 14 Jul 2001, Chen CM. 2933.

 Habitat: Solitary to densely gregarious under Pinus taiwanensis Hayata in summer.

Taiwan, Japan, North America, China (Sichuan).


Chen, CM et al. 2003.


C. M. Chen

 Note: F. paluster is distinguishable from its congeneric species by having vinaceous red pileus, large and almost lamellate hymenophore, and the reaction of hyphae of its trichodermium in Melzer's. It is closely related to Boletinus asiaticus Sing., but the two species are distinguishable in the field. B. asiaticus has fistulose stipe and prominent partial veil, of which the latter covers lamellae from the stipe to the margin of pileus, whereas F. paluster has a solid stipe and evanescent annulus. Also, B. asiaticus has pileus of 4-12.5 cm in diameter, longer than 0.8-7 cm for F. paluster, and the former has spores of 10-12 μm in length, longer than 8-10 μm for the latter.