156 BULLETIN OF THE NEW YORK STATE MUSEUM 
Boletus cyanescens Bvt. 
Biuinc BoLetus 
Hym. Eur. p. 517. Syl. Fung. Vol. VI, p. 44 
Pileus convex or nearly plane, opaque, floccose-squamose 
or covered with an appressed tomentum, pale-buff, grayish- 
yellow, alutaceous or somewhat brown, flesh rigid, white, 
guickly changing to blue where wounded, tubes free, white, 
becoming yellowish, the mouths minute, round, changing 
color like the flesh; stem ventricose, villose-pruinose, stuffed, 
becoming cavernous, contracted and even at the top, colored 
like the pileus; spores subelliptical, .o004 to .o005 in. long, 
.00025 to .0003 broad. 
Pileus 2 to 5 in. broad; stem 2 to 4 in. long, 8 to 18 lines 
thick. 
Woods and open places. New York, Peck. New Eng- 
land, Frost, Bennett. Minnesota, /oknson. Wisconsin, 
Bundy. 
This well-marked and very distinct species appears to be 
northern in its range. The color of the American plant, so 
far as I have seen it, is buff-yellow or grayish-yellow, but 
brownish hues are attributed to the European plant. When 
fresh, wounds of the flesh or tubes quickly assume a blue 
color which soon fades to violet or purple and finally disap- 
pears. The European plant is said to exude a blue juice 
under pressure. 
Boletus castaneus BvuLt. 
CHESTNUT BOLETUS 
Hym. Eur. p. 517. Syl. Fung. Vol. VI, p. 45 
Pileus convex, nearly plane or depressed, firm, even, dry, 
minutely velvety-tomentose, cinnamon or reddish-brown, flesh 
white, unchangeable; tubes free, short, small, white becom- 
