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Key to Boletus in North America (Page Four)

[Pore surface not red or orange.]


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.


  • Pore surface not bruising blue to greenish blue; cut flesh not staining blue to bluish on exposure. (1/2)

    Page Seven

  • Pore surface bruising blue to greenish blue (quickly or slowly), or cut flesh staining blue to bluish on exposure (quickly or slowly). (2/2)

      > Stem not reticulate, or merely faintly so at apex. (1/2)

      Page Five

      > Stem distinctly reticulate, or coarsely reticulate to shaggy. (2/2)

        ° Found west of the Rocky Mountains, excluding Texas. (1/2)

          ~ Stem not predominantly yellow overall (though yellow may occur at apex or in combination with other colors). (1/2)

            * Stem red to carmine red, with whitish to pinkish reticulation. (1/2)

            Boletus calopus
            At Fungi of Poland

            * Not as above. (2/2)

              Cap pale pinkish to pink. (1/2)

              Boletus pulchriceps

              Cap olive to brownish or reddish brown. (2/2)

              Boletus spadiceus

          ~ Stem predominantly yellow overall. (2/2)

            * Cut flesh instantly and consistently turning to blue. (1/2)

              Stem without red colorations, but with olive-brown to black shades near the base. (1/3)

              Boletus coniferarum

              Stem covered on upper two-thirds (or more) with red reticulation. (2/3)

              Boletus haematinus

              Stem with reddish tints near the base, covered on upper half (or more) with yellow reticulation. (2/3)

              Boletus regius
              At Fungi of Poland

            * Cut flesh not turning to blue, or doing so only slowly and/or erratically. (2/2)

              Stem strongly reticulate with yellow reticulation, with a reddish base; cap surface macrochemical reactions unknown. (1/5)

              Boletus abieticola

              Stem with reddish brown stains, especially near the base, and inconspicuous yellow reticulation on upper portion; cap surface macrochemical reactions unknown. (2/5)

              Boletus appendiculatus
              At MykoWeb

              Stem coarsely and deeply reticulate, with red areas near the base, reticulation becoming rusty red; cap surface macrochemical reactions unknown. (3/5)

              Boletus holoxanthus

              Stem without red shades, sometimes with brown stains, often whitish and narrowed at base; cap flashing green, then turning reddish brown with ammonia. (4/5)

              Boletus spadiceus

              Stem with reddish brown streaks; only partially reticulate, at the apex; stem staining brownish to reddish brown when handled; cap instantly reddish brown with ammonia. (5/5)

              Boletus subtomentosus

        ° Found east of the Rocky Mountains, or in Texas. (2/2)

          ~ Exposed flesh not turning blue when sliced and exposed, or only bluing slightly and erratically. (1/2)

            * Pore surface yellow when young but soon becoming red, then orange red. (1/2)

            Boletus carminiporus

            * Not as above. (2/2)

              Stem yellow above, pink to reddish below; cap surface green, then olive with ammonia; flesh bright yellow, then gray with ammonia. (1/6)

              Boletus pallidoroseus

              Stem yellow above, rosy red or darker red below; cap surface yellowish or red, then olive with ammonia; flesh yellowish (greenish blue near tubes) with ammonia. (2/6)

              Boletus peckii

              Stem golden yellow above, pale yellow but dotted or streaked burgundy red below; cap surface yellowish with ammonia; flesh dark yellow with ammonia. (3/6)

              Boletus rufomaculatus

              Stem yellowish or brownish but without red shades; cap surface showing a green flash, then reddish brown with ammonia; flesh reaction with ammonia unknown. (4/6)

              Boletus spadiceus

              Stem rusty cinnamon to brown; cap surface "bluish green, then bright orange surrounded by dull grayish green, then entirely yellow orange" (Bessette, 2000) with ammonia; flesh negative with ammonia. (5/6)

              Boletus subcaerulescens

              Stem mostly yellow, with reddish brown streaks; cap surface instantly reddish brown with ammonia; flesh reaction with ammonia unknown. (6/6)

              Boletus subtomentosus

          ~ Exposed flesh rapidly and consistently turning blue when sliced and exposed. (2/2)

            * Young cap, pore surface, and stem bright yellow; flesh dark red in the base of the stem. (1/3)

            Boletus pseudosulphureus

            * Cap whitish to grayish when young, darkening to pale brown; typically becoming cracked, with white showing in the cracks; cap margin inrolled well into maturity; stem less than 2 cm thick; cap surface and flesh negative with ammonia. (2/3)

            Boletus inedulis

            * Not as above. (3/3)

              -- Taste mild, not distinctive. (1/2)

                Cap brown to yellow brown; young cap margin even; pore surface dark yellow-brown with bright yellow near the margin. (1/5)

                Boletus fagicola

                Cap yellow brown; young cap margin with projecting sterile portion; pore surface yellow becoming olive yellow. (2/5)

                Boletus luridellus

                Cap dark red to purplish red; young cap margin with projecting sterile portion; pore surface bright yellow to golden. (3/5)

                Boletus purpureorubellus

                Cap rusty brown to pale brown, often with reddish spots; young cap margin with projecting sterile portion; pore surface yellow becoming olive yellow. (4/5)

                Boletus rufomaculatus

                Cap rosy red to pink, becoming pinkish brown; young cap margin even; pore surface yellow becoming olive yellow. (5/5)

                Boletus speciosus

              -- Taste bitter or sour. (2/2)

                Cap olive brown to dark yellow-brown; flesh yellow brown with ammonia. (1/3)

                Boletus calopus
                At Fungi of Poland

                Cap olive brown to grayish tan; flesh olive green with ammonia. (2/3)

                Boletus roseipes

                Cap pinkish purple; flesh dull orange with ammonia. (3/3)

                Boletus roseopurpureus



    Cite this page as:

    Kuo, M. (2003, June). Key to Boletus in North America (page four). Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/boletus_04.html


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