This is Boletus cyanescens, or the bluing Boletus, as named by Professor Peck in his work on Boleti.
"Among the Mushrooms" by Ellen M. Dallas and Caroline A. Burgin
It is questionable whether it is clearly distinguished from the genus Boletus.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc." by George Francis Atkinson
This class will include all gill-bearing fungi, Polyporus, Boletus, Hydnum, etc.
"The Mushroom, Edible and Otherwise" by M. E. Hard
The edible Polyporeae are found in the genera Boletus, Strobilomyces, Gyrodon, Boletinus, Polyporus, and Fistulina.
"Student's Hand-book of Mushrooms of America, Edible and Poisonous" by Thomas Taylor
COMMON NAMES, Larch Agaric, Larch Boletus, Purging Agaric, White Agaric.
"New, Old, and Forgotten Remedies: Papers by Many Writers" by Various