126 POLYPOREI. 



Tubes, at first concave, stuffed, colored like the pileus, 

 becoming paler, depressed around the stem. 



Stem, stout, short, tapering upwards, abruptlj' narrowed at 

 the base, minutely furfuraceous, covered like the pileus, 

 purplish gray within. 



Spores, subferruginous, .00045 to .0006 inch long, .0002 



to .00025 inch broad. 



This species was first found some years ago in an open oak woods near 

 Cedar Creek in our Valley. I had it determined by Prof. C. H. Peck. 



Group VI. I^URIDI. 



In this tribe the tubes and their mouths are differently 

 colored, the latter being red or some shade 6i red (lurid). By 

 this character the species are easily distinguished from those of 

 other tribes. 



B. alveolatus. B. & C. Alveolate Boletus. 



Pileus, convex, shining, bright crimson or maroon color, 

 sometimes paler, with patches of yellow ; flesh firm, white, 

 quickly changing to blue where wounded. 



Tubes, adnate, yellow, with maroon- colored mouths,' 

 hymenial surface secreting a glary fluid in drops. 



Stem, rough, with deep reticular depressions or alveolate ; 

 with a bright red or yellow margin. 



Pileus two to three inches broad. 



Spores, yellow brown, .0005 to .0006 inch long, .00016 to 



.0002 inch broad. 



This species is quite common, and on account of the bright red pileus 

 it is not easily overlooked. Chaparral woods. 



B. luridus. Lurid Boletus. 



Pileus, pulvinate, tomentose, umber, then subviscid, dingy, 

 flesh yellow, turning quickly to blue where wounded. 



