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pale grey with olive, brownish spots; margins can be pinkish especially in age; 10-25 (30) cm in diameter, at first hemispheric later becoming convex; surface glabrous or finely tomentose, areolate during dry weather and subviscid when moistened; margin acute, undulating.
At first yellow, soon red, paler orange-yellow to cap margin; bruising blue; tiny, up to 2 per mm. Tubes yellow, bruising blue when exposed, in age olive; cap context above tubes yellow; depressed at stipe; 10-30 mm long.
Bulbous, 10-12 x 5-10 cm; upper part yellow, toward base carmine-red, sometimes only at the base red; upper part with yellowish to red reticulation.
Spore print olive-brown. Spores ellipsoid, smooth, thick walled, 10-15 x 4.5-6 (3.5-6.5) µm.
Fall - early winter, solitary or gregarious in warm places, under beech and oaks, on calcareous soils.
Poisonous. Toxin unknown. Produces gastro-enteric disturbances: stomach pain, vomiting & diarrhea that start from 15 min to 4 hours after ingestion and persist for 1-2 days.
Kingdom: fungi; Phylum: Basidiomycota; Subphylum: Basidiomycotina; Class: Homobasidiomycetes; Order: Boletales; Family: Boletaceae; Genus: Boletus
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