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Is this Bicolor Bolete?


Leightonking22
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Definitely not any of the species or varieties in the Baorangia bicolor group (the "Bicolor Bolete"). The B. bicolor types are eastern NA mushrooms. They associate mainly with eastern NA oaks (and possibly sometimes spread to hemlock or white pine, also eastern NA trees). B. bicolor has a stem that is red (or reddish) on the lower 1/2-3/4 and yellow above. The flesh inside the stem is yellow. 

I don't know the boletes of CA. The west coast species are mostly (all?) different from those that are found east of the Rockies. My best guess for this is Aureoboletus flaviporus. 

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Here are 7 pages of Mushroom Observation posts where A. flaviporus is proposed as an ID (some more confident than others as evidenced by the %). https://mushroomobserver.org/observer/observation_search?pattern=Aureoboletus+flaviporus Many show mushrooms with bright yellow pore surface, which is what appears to be typically reported for this species. But, there are a few where the pore surface is a bit duller, kinda like the ones seen in this discussion. Where I live here in PA we have two Aureoboletus species that are common, A. innixus and A. auriporus, each of which have vividly golden-yellow pores. With post-mature specimens the color may fade, as seen in   https://mushroomobserver.org/213886?q=1l7LT . (To a lesser extent we also get A. roxanae, which has pore color somewhat more variable). The mushroom seen in this discussion reminded me of A. projectellus, a species common in the Pine Barrens of NJ https://mushroomobserver.org/257754?q=1l7LT . The resemblance was what prompted me to check "Aureoporus" at  https://www.mykoweb.com/CAF/species_index.html#1_18 .

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