Phylum:Basidiomycota >> Class: Basidiomycetes >>  Order: Boletales 
 BCRC Number NO BCRC Number!  
 Scientific Name: Suillus spraguei

Suillus pictus (Peck) Smith & Thiers, Contrib. Monogr. N. Amer. sp. of Suillus p.31. 1964.

Boletinus pictus (Peck) Peck, Bull. N.Y. State Mus. 2(8):77. 1889.

Boletus pictus Peck, Ann. Rep. N. Y. State Cab. 23:128. 1872.

Suillus spraguei (Berk. et Curt.) Kuntze, Revis. Gen. Pl. 3: 536. 1898.

Basionym: Boletus spraguei Berk. et Curt. in Berk., Grevillea 1:35. Ⅸ. 1872.

 Description: Pileus 2.5-5 cm broad, broadly conic to convex, the margin incurved, expanding to broadly conic-umbonate with a decurved margin, margin typically appendiculate with veil fragments, surface dry, viscid when wet, coarsely fibrillose, cuticle at first ocher-red , fading in age, the tips of the squamules often fuscous, context up to 0.8cm thick, yellow, changing to pinkish gray upon exposure. Tubes adnate to decurrent, about 5 mm deep, bright yellow. Pores con-colorous with tubes, angular, 1-1.5 mm broad, smaller toward the pileus margin, often compound, changing to reddish or brownish when injured. Stipe 3-5 cm long, 6-10 mm thick, enlarged downward with a clavate base, solid, context white in the interior or brownish at the base, cortex yellowish, lower portion sheathed with remains of a fibrillose coating similar to the fibrils of the pileus and breaking into patches, apex yellow and some-what reticulate with decurrent lines from the tube. Spore print cinnamon brown. Spores 8-12 (14) × 4.5-5 μm, smooth, narrowly ovate in face view, narrowly inequilateral in profile view. Basidia 30-37 × 8-10 μm, hyaline in KOH solution, sterigmata four, 4-5 μm long. Pleuro-cystidia 75-135 × 10-14 μm, subcylindric, flexuous or straight and with a subacute to obtuse apex, hyaline and thin-walled but usually with bister incrusting material near the base. Tube trama gelatinous and divergent. Pileus trichodermium of loosely tangled hyphae with short inflated cells near apex and with orange-buff content revived in KOH solution. Clamp con-nections absent.

Taiwan, Miaoli: Jenshan, alt. 2300m, 13 Sep 1996, Huang HW 2055.

 Habitat: Scattered under Pinus morrisonicola Hay. forest.

Taiwan, China, Japan, North America.


Yeh, KW and Chen, ZC. 1980.


C. M. Chen

 Note: Besides caulocystidia in fascicles which become colored as the basidiocarp develops, the viscid pileus is a concrete character in Suillus. But this species has a dry pileus and is recognized by the dense woollly, dry red coating on the pileus and stipe. Nevertheless, some pleurocystidia with incrustations of brown particles at base and lacking clamps on the basidiocarp hyphae connect this species with the viscid group. It is known to have mycorrhizal association with Pinus or Larix plants that there is little room for error in field identification.