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Key to Boletus in North America (Page Three) Back to Previous Choice in Boletus [Pore surface some shade of red or orange; cut flesh bluing on exposure; cap not pale whitish or pale pinkish when young; mature stem not reticulate.] 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. > Young cap yellow. (1/2) Cap yellow to maturity, usually covered with yellow powder; pore surface reddish brown or yellowish at first; stem yellowish with a brick-red to orange-red overlay, sometimes with yellow powder, base with yellow mycelium. (1/2) Boletus hemichrysus Cap yellow becoming brown; pore surface dark brown when young; stem whitish to yellowish with brown overlay, with olive shades. (2/2) > Young cap otherwise colored. (2/2) Cap brown to dark brown, becoming dull cinnamon; pore surface brown becoming reddish brown; stem yellowish with brown overlay. (1/4) Boletus vermiculosus Cap reddish to brick-red, fading; pore surface yellow, developing orange-red shades; stem yellow, becoming orange to red. (2/4) Boletus miniato-pallescens Cap dull rose to bright orange-red, fading to brick-red; pore surface yellow to olive, becoming reddish brown; stem colored like the cap but paler. (3/4) Boletus subfraternus Cap variable, orange-pink to orange-yellow or reddish to rusty; pore surface partly yellow, becoming red, then fading; stem yellow at apex, reddish below. (4/4) Boletus subluridus > Young cap brownish or yellowish, without red to orange shades. (1/2) Cap yellow, usually covered with yellow powder; pore surface red-brown, sometimes yellowish at first; stem yellow with red overlay, sometimes with yellow powder, base with yellow mycelium; reactions to ammonia unknown. (1/5) Boletus hemichrysus Cap brown to yellow-brown; pore surface red to orange-red or dull orange; stem whitish to yellowish, with yellow apex, with carmine red dots; flesh bluish gray with ammonia. (2/5) Boletus hypocarycinus Cap dark brown to black, becoming red-brown to olive-brown; pore surface orange red to dull orange; stem yellow with red overlay; blued flesh yellow, then white with ammonia. (3/5) Boletus luridiformis Cap brownish olive to yellowish olive; pore surface dark maroon becoming red-brown; stem yellow with red overlay, olive at the base; flesh blue to yellow with ammonia. (4/5) Boletus pseudo-olivaceus Cap cinnamon brown to yellow-brown, red, or orange; pore surface red, brownish red, or reddish orange; stem red and yellow, yellow at apex, dark red hairs at base; blued flesh rusty orange with ammonia. (5/5) > Young cap with red to orange shades. (2/2) Cap dark rose red, becoming brownish red; pore surface cinnabar red; stem yellow with brick-red granules; found in California. (1/8) Boletus amygdalinus Cap variable, dull rose red to brownish orange, fading to brown or reddish brown; pore surface red to orange-red, sometimes yellowish at first; stem yellow with reddish shades and streaks; found from Florida to Texas. (2/8) Boletus fairchildianus Cap dark red to apple red, becoming brick-red to rusty; pore surface orange red to red; stem colored like the cap; found from New England to Michigan. (3/8) Boletus bicolor var. borealis If you do not want to spend hours identifying your specimen with reference to chemical reactions, microscopic details, and dubious color choices, this is a good time to declare you have found a member of the Boletus subvelutipes species cluster and spend some quality time with your loved ones, who will miss you otherwise. (4/8) Cap variable, dull reddish orange to pinkish orange, becoming dark reddish brown to olive brown; pore surface orange red becoming dull orange to yellow; stem yellow with reddish to brownish dots; found in eastern North America. (5/8) Boletus discolor Cap brick, becoming reddish brown; pore surface maroon, becoming orange-red; stem yellow with orange-cinnamon to brown dots; found in the Great Lakes region. (6/8) Boletus rufocinnamomeus Cap bright red to pinkish to orange red; pore surface red becoming orange red; stem pale yellow, without dark red hairs at the base; found in eastern North America. (7/8) Boletus subluridellus Cap cinnamon brown to yellow brown, red, or orange-yellow; pore surface reddish brown, red, or orange; stem red and yellow, yellow at apex, with dark red hairs at the base; found in eastern North America. (8/8) Cite this page as: Kuo, M. (2003, June). Key to Boletus in North America (page three). Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/boletus_03.html © MushroomExpert.Com |