Polyporacese 



Boletus, attenuated downward, everywhere covered with a deciduous reticulated 

 bark two lines high and separating like the bark of birches, pale-yellow 

 without and within. 



Pileus 1.5 in. broad. Stem 5-6 in. long. 



Ligneous earth. North Carolina, ScJiweinitz, Curtis; Pennsylvania, 

 Schweinitz. Peck, Boleti of the U. S. 



During several seasons I found B. Betula in Woodland Cemetery, 

 Philadelphia. 



Edible qualities good. 



CALO'PODES. Gr. beautiful; Gr. feet. 



Stem stout, at first bulbous, typically venose-reticulated with veins. 

 Tubes adnate, their mouths not reddish. 



The reticulate stem and adnate tubes of one color distinguish the 

 species of this tribe. In the Luridi the mouths of the tubes are differ- 

 ently colored, and in the closely related Edules the tubes are more or 

 less depressed around the stem or sub-free, and their pores are com- 

 monly stuffed when young. Fries did not admit species with whitish 

 tubes into this tribe, but we have done so in those cases in which this 

 was the only character to exclude them. 



Tubes yellow or yellowish I 



Tubes white or whitish, at least when young 7 



I . Tubes or flesh changing to blue where wounded 2 



I . Tubes or flesh not changing to blue where wounded 5 



2. Pileus red, at least when young 3 



2. Pileus some other color 4 



3. Stem red B. Peckii 



3. Stem yellow or reddish only at the base B. speci'osus 



4. Tubes angular, pileus olivaceous B. calopus 



4. Tubes rotund, pileus not olivaceous B. pachypus 



5 . Pileus viscid B. Curtisii 



5. Pileus pulverulent, stems cespitose B. retipes 



5. Pileus neither viscid nor pulverulent 6 



6. Stem yellow B. ornatipes 



6. Stem brown B. modestus 



6. Stem yellowish-white B. rimosellus 



7. Pil-eus some shade of red 8 



438 



