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

Fuscoboletinus ochraceoroseus (Snell) Pomerleau & Smith, Brittonia 14: 157. 1962.

Basionym: Boletinus ochraceoroseus Snell, Mycologia 33: 35. 1941.

 Description: Pileus 4-9 cm broad, convex to subumbonate, becoming plane or the margin slightly uplifted; surface dry and pitted, fibrillose to fibrillose-squamulose, the scales usually appressed toward the margin, variable in color; margin incurved and appendiculate with fragments of broken veil when young. Context thick, soft, pale bright yellow, often with a pinkish red zone under fibrils, unchanging when bruised. Hymenophore 3-5 mm thick, adnate to decurrent, boletinoid, dull olive-ocher to ding brown, pores compound, 2-4 × 1-2 mm broad, elongated to mostly angular, radiately arranged to sublamellate. Stipe 3-5 cm long, 1-1.8 cm broad, solid, subequal with subbulbous base, concolorous with tubes and reticulate at apex. Annulate, pallid to yellowish, usually adhering to margin of pileus. Spore deposit dark vinaceous-brown. Spores 9.5-12 × 4-4.5 μm, yellowish in KOH, subcylindric to slightly inequilateral, smooth, a few dextrinoids in Melzer's. Basidia 26-32 × 8-9 μm, narrowly clavate to subcylindric, 4-spored, sterigmata 2-3 μm long, subhyaline in KOH. Pleurocystidia 60-90 × 11-15 μm, scattered to abundant, subcylindric to subventricose, obtuse to abruptly acute, thin-walled, often flexuous, punctate and incrusted with brownish material when fasciculated. Cheilocystidia similar to the pleurocystidia but smaller, usually in clusters. Caulocystidia septate, terminal cell 15-25×5-7 μm, subcylindric to clavate, apices rounded, thin-walled, mostly hyaline in KOH, numerous, mixed with scattered caulobasidia. Tube trama parallel type, 80-90 μm thick, pallid melleous in KOH, hyphae 7-9 μm in diameter, thin-walled. No clamp connections were observed. Pileus trama of loosely interwoven hyphae 6-21 μm in diameter, hyaline in KOH, thin-walled, gelatinous. Pileus surface layer composed of compactly interwoven, cylindrical hyphae, 8-23 μm broad.

Taiwan, Taichung: Da-Shiu-Shan, alt. 2,350m, 27 Jun 2001, Chen CM. 2884. Taitung: Shiang-Yang, alt. 2,300 m, 14 Jul 2001, Chen CM. 2935.

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

Taiwan, North America, China (Sichuan, Yunnan, Guizhow, Tsinghai, Tibet).


Chen, CM et al. 2003.


C. M. Chen

 Note: F. ochraceoroseus is a common bolete in Taitung and may be found in colors ranged from dark lemon-yellow to brick-red. Its pileus is always densely tomentose to fibrillose over the surface. The stipe is short. F. paluster and Suillus spraguei (Berk. et Curt.) Kuntze are the other species to have densely tomentose, but differ from F. ochraceoroseus in other characters. F. paluster has a narrow stipe, and its pileus surface is deep red from the colored floccose-tomentose covering, which breaks up into fibrillose squamules on the pileus. S. spraguei is fairly similar in coloration to F. ochraceoroseus, but the former is associated with Pinus morrisonicola Hay. and the latter to P. taiwanensis Hay. Also, the spore deposit color of S. spraguei is olive-brown to tawny-olive, not tinted with vinicolor like that of F. ochraceoroseus.