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Question on Gilled Boletes


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Are there two separate species called by this name?

The reason I ask is that both Bessette and Baroni use Phylloporus rhodoxanthus, while Sturgeon uses Phylloporus leucomycelinus. And none show the other name as a synonym. Both are shown as edible. 

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P. rhodoxanthus has yellow basal mycelium; P. leucomycelinus has white basal mycelium. These are two different species. Other than the color of the basal mycelium, they have a very similar appearance. There are a few other NA species of Phylloporus. Here in eastern NA the two species discussed seem to be the most common. 

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I think P. leucomycelinus may be a relatively recent name.

Boletes of Eastern North America (Bessette/Roody/Bessette) says P. leucomycelinus  and P. rhodoxanthus are "nearly identical". I find each type in oak woods. 

https://mushroomobserver.org/281730?q=1903I

https://mushroomobserver.org/286826?q=1903I

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