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Updates added as of
July 1, 2013

This page is used to feature mushrooms that are prevalent for the particular time of the year or, during the winter months, to feature some of the less desirable or hard to find mushrooms. To see some of our previous features follow the link above.

Boletus frostii

For August 2012

Boletus frostii
aka Frost’s Bolete

Frost’s Bolete is a very spectacular Bolete in the forest. This Bolete has a sticky cap at first that is deep blood red in color, its stalk has a very prominent raised network of ridges that are sometimes blood red like the rest of the cap and stalk but are sometimes yellow overlying the blood red background of the stalk. This is the only Bolete with red pores that I know as edible. Guidebooks advise against eating it though since many red-pored Boletes that stain blue are poisonous.

The cap of Frost’s Bolete ranges from 2 to 6 inches across. The tubes, sunken around the stalk (adnexed), are yellow but the pores are an intense red to purple fading to orange red with age. The equal stalk is 1 ½ to nearly 5 inches tall and ½ to 1 inch thick. The somewhat thick raised webbing colored as noted above on the stalk is fairly distinct. Two other boletes with similar webbing come to mind: Russell’s Bolete (Boletellus russellii) and Austroboletus betula, actually several of the species in Austroboletus have prominent networks of ridges. The pores of Frost’s Bolete bruise blue as does the yellow flesh which instantly turns blue when cut. The spore print is olive brown.

Group of Boletus Frostii on ground

A small group of Frost's Bolete found in a Michigan woods

Boletus frostii breaking through leaf clutter Boletus Frostii popping through the leaf clutter.

I have tasted Frost’s Bolete. Though many blue-bruising red-pored Boletes are poisonous, Frost’s Bolete is very distinct and easy to identify. Unfortunately, I do not find the taste to be very interesting. The flavor is somewhat sour reminiscent of a citrus-like flavor and the consistency is soft. You might as well stay away from eating all red-pored Boletes.