Polyporaceae 



of yeast. Tubes rather short, depressed around the stem, almost free, Boletus, 

 yellowish mottled with brown, the mouths minute, stuffed when young. 

 Stem stout, thick, sometimes swollen in the middle and sometimes bulb- 

 ous, beautifully reticulated but the reticulations sometimes disappear- 

 ing with age, orange-yellow tinged with brown. Flesh of a brighter 

 yellow than that of the pileus. 



Pileus 5-10 cm. broad. Stem 6-8 cm. long, 2.5-3.5 cm. thick. 



Oak woods. Mt. Gretna, Pa. August and September. Mcllvaine. 



The thick, beautifully reticulated stem, the deep velvety brown color 

 of the pileus and the yellow color of the flesh serve to distinguish this 

 species. Peck, Bull. Torr. Bot. Club, Vol. 27, January, 1900. 



It is one of the best edible mushrooms. I have also found it in New 

 Jersey. 



LU'RIDI. 



Stratum of tubes rounded toward the stem and free, their mouths at 

 first closed and red. Pileus compact, then soft, cushion-shaped, the 

 flesh juicy, changeable. Stem stout, at first short, bulbiform, then 

 elongated and subequal, subreticulated or dotted. 



Growing especially in frondose woods. Very poisonous. 

 In this tribe the tubes and their mouths are differently colored, the 

 latter being red or some shade of red. By this character the species 

 are easily distinguished from those of other tribes. 



Flesh distinctly changing color where wounded I 



Flesh not at all or scarcely changing color where wounded 7 



I . Flesh white or whitish 2 



I . Flesh yellow or yellowish 5 



2. Flesh changing to red or violet B. Satanus 



2. Flesh changing to blue 3 



3. Stem roughened B. alveolatus 



3 . Stem even 4 



4. Stem hairy at the base - B. subvelutipes 



4. Stem not hairy at the base B. vermiculosus 



5 . Stem red " B . luridus 



5 . Stem yellow or reddish only at the base 6 



6. Pileus purplish-red B. purpureus 



6. Pileus gray B. firmus 



6. Pileus yellow or yellowish B. magnisporus 



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