Photo by Becca Mahoney

The previous genus, Exsudoporus comes from the latin "exsudo", or to sweat and porus - from or of the pores. Genetic analysis places this species closer to  the butter-boletes from which the genus name is derived ("Butyri" is Latin for Butter, and boletus to indicate the larger porous family; Butyriboletus is a literal translation of "butter-bolete").

This is another robust member of the family Boletaceae that is easy to identify based on macro-morphological structures alone. B. frostii is tart and fruity and considered by most to be a fine edible.   

Candied Apple Cap

One  of the common names for this mushroom is the apple or candy-apple  bolete, which is not surprising given that the cap color is often  reminiscent of a candied apple (and just about as sticky). Please note  that environmental and genetic variations can produce a duller, browner  cap.

Photo by Becca Mahoney 

The Stipe

 Perhaps the most striking feature of B. frostii is the exaggerated reticulation (netting) of the stipe in bright red and yellow tissue. 

Crimson Pores

Here you can see the crimson-red pore-layer exuding fluid. This is called guttation and is common amongst many pored fungi. 

Photo by Alicia Hafner

Aureoboletus betula is probably the most convincing look a like for B. frostii but features a taller stipe, much more vivid yellow colors, less guttation, and typically a much smaller cap