Polyporaceae 



The plant is sometimes cespitose. I have observed a greenish tint to Boletus, 

 the freshly shed spores, but it soon disappears. Boletus subchromeus 

 Frost Ms. is this species. Peck, Boleti of the U. S. 



B. auriflam'meus B. and C. flaming yellow. Pileus convex, dry, 

 powdered, bright golden-yellow. Flesh white, unchangeable. Tubes 

 plane or convex, free, yellow, their broad angular mouths scarlet. Stem 

 slightly tapering upward, powdered, colored like the pileus. Spores 

 10-12.5x5/4. 



Pileus 8-12 lines broad. Stem 1-1.5 in. long. 



Woods. North Carolina, Curtis; New York, Peck. 



This is evidently a rare species and as beautiful as it is rare. The 

 whole plant is bright-yellow except the tube mouths, and is sprinkled 

 with yellow dust or minute yellow branny particles. In the New York 

 specimen the scarlet color is wanting in the marginal tube mouths and 

 the stem is marked with fine subreticulating elevated lines. In other 

 respects it agrees well with the diagnosis of the species. Peck, Boleti 

 of the U. S. 



SUBPRUINOSI sub, pruina, hoar frost. 



Pileus glabrous, but more often pruinose. Tubes adnate, yellowish. 

 Stem equal, even, neither bulbous nor reticulated. 



The species of this tribe have the pileus neither viscid nor distinctly 

 and permanently tomentose. Typically it is glabrous or merely pruinose, 

 but Fries has admitted into the group one species with a pulverulent, 

 and one with a silky pileus. The species are not sharply distinguished 

 from those of the following tribes, and possibly some have been admitted 

 here which might as well have been placed there. Some of the species 

 are variable in color and their characters are not sufficiently well known. 



Tubes bright-yellow, golden or subochraceous i 



i . Tubes pale or whitish-yellow 6 



i . Tubes changing to blue where wounded 2 



i . Tubes not changing to blue 3 



2. Stem pallid, with a circumscribing red line at the top..B. glabellus 

 2. Stem yellow, sometimes with red stains. . . .B. miniato-olivaceus 



2. Stem red, yellow at the top B. bicolor 



3. Stem viscid or glutinous when moist B. auriporus 



423 



