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Key to Boletus in North America (Page Ten)

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[Pore surface not red or orange; pore surface not bruising blue to greenish blue; cut flesh not staining blue to bluish on exposure; found west of the Rocky Mountains, excluding Texas.]


Note: This key is in bad need of revision. The non-dichotomous format is annoying and, with the hindsight of a few years, I see many areas that require different emphasis, fleshing out, paring down, and so on. Don't hold your breath waiting, but I will eventually revise the key completely.


  • Stem reticulate, at least near the apex. (1/2)

      > Easily recognized species. (1/2)

        ° Cap dry and smooth, whitish, with an even margin by maturity; pore surface white becoming yellowish to olive; stem whitish to pinkish or brownish; flesh white, not staining on exposure; cap orangish with ammonia; spores 13-15 µ long; found under Ponderosa Pine and other conifers (also Coast Live Oak); in and west of the Rockies. (1/4)

        Boletus barrowsii

        ° Cap dry, smooth or finely hairy, grayish, with an even margin; pore surface white becoming grayish to brownish; stem whitish, developing bright yellow stains; flesh whitish, not staining on exposure or becoming dingy; cap negative with ammonia; spores 9-13 µ long; found under hardwoods; widely distributed. (2/4)

        Boletus griseus

        ° Cap dry, velvety to hairy, dark red to reddish brown, with an overhanging sterile margin; pore surface yellow to greenish yellow; stem reddish, coarsely reticulate and shaggy; flesh pale yellow, not staining on exposure; cap reaction to ammonia not recorded; spores 16-24 µ long; found under conifers (sometimes growing from decayed wood); widely distributed. (3/4)

        Boletus mirabilis
        Photo Only

        ° Cap dry, smooth or finely velvety, pale pinkish, with an overhanging sterile margin; pore surface yellowish becoming olive, bruising bluish weakly or not at all; stem yellow above, whitish below, with white reticulation; flesh pale yellow, sometimes staining bluish on exposure; cap reaction to ammonia not recorded; spores 11-13 µ long; found under oak; Arizona. (4/4)

        Boletus pulchriceps

      > Not as above. (2/2)

        ° Pore surface initially white or whitish. (1/2)

          The mushrooms below form the western Boletus edulis cluster.

          ~ Cap dry or moist, smooth or pitted, dark brown, with an even margin; pore surface white becoming yellowish; stem white developing pinkish brown shades; flesh whitish or pale pinkish, not staining on exposure; cap reaction to ammonia not recorded; spores 12-14 µ long; found under hardwoods; California. (1/4)

          Boletus aereus
          At MykoWeb

          ~ Cap sticky when fresh, smooth or wrinkled, brown to reddish brown, with an even margin; pore surface white becoming yellowish, then olive; stem white or pale brown, with white reticulation; flesh white, not staining on exposure; cap orange with ammonia; spores 13-19 µ long; found under conifers; widely distributed. (2/4)

          Boletus edulis

          ~ Cap moist, conspicuously wrinkled, cinnamon brown, with an even margin; pore surface white becoming yellowish to olive; stem whitish or cinnamon; flesh white, not staining on exposure; cap negative with ammonia; spores 14-17 µ long; found under conifers; California. (3/4)

          Boletus mottiae
          At MykoWeb

          ~ Cap dry, usually somewhat wrinkled, reddish brown, with an overhanging sterile margin; pore surface white becoming yellowish, then olive, bruising rusty brown; stem white or yellowish above, brownish below, darkening on handling; flesh white, not staining on exposure; cap reaction to ammonia not recorded; spores 15-20 µ long; found under conifers; widely distributed. (4/4)

          Boletus pinophilus

        ° Pore surface initially pale to bright yellow. (2/2)

          ~ Cap with an overhanging sterile margin, at least when young. (1/2)

            * Cap dry and smooth, reddish to yellowish brown; pore surface pale yellow becoming dark yellow or olive; stem yellow with reddish brown stains; flesh yellow, sometimes staining blue exposure; cap reaction to ammonia not recorded; spores 12-16 µ long; found under oaks; California and Oregon. (1/3)

            Boletus appendiculatus
            At MykoWeb

            * Cap dry and velvety, brown; pore surface bright yellow; stem white to pale yellow, with an orange-yellow apex; flesh whitish, not staining on exposure; cap dark purplish red with ammonia; spores 10-14 µ long; found under oak; California. (2/3)

            Boletus citriniporus
            At MykoWeb

            * Cap dry, velvety, brown; pore surface yellowish, usually bruising greenish, then brownish; stem yellow with reddish brown stains; flesh whitish, sometimes staining bluish on exposure; cap reddish brown with ammonia; spores 10-15 µ long; found under hardwoods or conifers; widely distributed. (3/3)

            Xerocomus subtomentosus

          ~ Cap margin even. (2/2)

            * Cap dry, smooth to nearly velvety or hairy, brown; pore surface pale yellow becoming dark yellow, not bruising; stem pale yellow at apex, brown below; flesh white, not staining on exposure; cap red or pink with ammonia; spores 13-18 µ long; found under conifers; Pacific coast. (1/3)

            Boletus fibrillosus
            At MykoWeb

            * Cap slimy, fairly smooth, cinnamon to reddish brown; pore surface bright yellow becoming greenish; stem yellow above, reddish brown to whitish below; flesh whitish or pale pinkish, not staining on exposure; cap slowly orange with ammonia; spores 11-15 µ long; found under hardwoods; California and Oregon. (2/3)

            Boletus flaviporus
            At MykoWeb

            * Cap dry, velvety, olive to reddish brown or brown; pore surface yellowish to olive, usually bruising bluish; stem yellowish with brownish stains; flesh pale yellow, sometimes staining bluish on exposure; cap with a green flash, then reddish brown with ammonia; spores 10-14 µ long; found under hardwoods or conifers; widely distributed. (3/3)

            Xerocomus ferrugineus

  • Stem not reticulate. (2/2)

      ° Fresh cap slimy. (1/2)

        ~ Cap smooth, reddish brown, with an even margin; pore surface bright greenish yellow; stem tan, sometimes with a reddish apex; flesh pinkish, not staining on exposure; cap reaction to ammonia not recorded; spores 13-16 µ long, amyloid, sometimes truncated; found in mixed woods; California. (1/2)

        Boletus amyloideus
        At MykoWeb

        ~ Cap fairly smooth, cinnamon to reddish brown, with an even margin; pore surface bright yellow becoming greenish; stem yellow above, reddish brown to whitish below; flesh whitish or pale pinkish, not staining on exposure; cap slowly orange with ammonia; spores 11-15 µ long; found under hardwoods; California and Oregon. (2/2)

        Boletus flaviporus
        At MykoWeb

      ° Fresh cap dry or merely moist. (2/2)

        ~ Easily recognized species. (1/2)

          * Cap small, finely velvety or powdery, purplish red or paler, with an even margin; pore surface yellowish; stem red and yellow; flesh yellow, sometimes staining bluish on exposure; cap reaction to ammonia not recorded; spores 11-18 µ long; found under conifers; Pacific Northwest to California. (1/2)

          Boletus coccyginus
          At MykoWeb

          * Cap velvety or dusted, often wrinkled, blackish to dark brown, with an even margin; pore surface yellow to olive, usually bruising bluish; stem with dense reddish or brownish dots; flesh white to pale yellow, sometimes staining bluish on exposure; cap green with ammonia; spores 12-15 µ long; found under hardwoods or conifers (sometimes on decaying wood); West Coast. (2/2)

          Boletus zelleri

        ~ Not as above. (2/2)

          * Cap velvety, brown, with an overhanging sterile margin; pore surface bright yellow; stem white to pale yellow, with an orange-yellow apex; flesh whitish, not staining on exposure; cap dark purplish red with ammonia; spores 10-14 µ long; found under oak; California. (1/3)

          Boletus citriniporus
          At MykoWeb

          * Cap velvety, olive to reddish brown or brown, with an even margin; pore surface yellowish to olive, usually bruising bluish; stem yellowish with brownish stains; flesh pale yellow, sometimes staining bluish on exposure; cap with a green flash, then reddish brown with ammonia; spores 10-14 µ long; found under hardwoods or conifers; widely distributed. (2/3)

          Xerocomus ferrugineus

          * Cap velvety, brown, with an overhanging sterile margin; pore surface yellowish, usually bruising greenish, then brownish; stem yellow with reddish brown stains; flesh whitish, sometimes staining bluish on exposure; cap reddish brown with ammonia; spores 10-15 µ long; found under hardwoods or conifers; widely distributed. (3/3)

          Xerocomus subtomentosus



    Cite this page as:

    Kuo, M. (2003, December). Key to Boletus in North America (page ten). Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/boletus_10.html


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