106 THE CHICAGO ACADEMY OF SCIENCES 



Fistulina pallida B. A: Raw 



Pileus reniform, pallid reddish; stem lateral; tubes decurrent. 

 Pileus 2\ to 5 cm. broad, about 2h cm. long, pulverulent, yellowish- 

 brown when dry; margin inflexed; stem 2 cm. long, S mm. thick, 

 striate when dry. 



A single specimen found on the ground in a ravine north of 

 Glencoe. September, 1903. According to Prof. Atkinson(Studies 

 of Am. Fung. p. 186), F. firma Pk. is apparently the same species. 



BOLETINUS. 



Stratum of tubes not easily separable from the pileus; pores 

 in more or less radiating rows, usually shorter than in Boletus. 

 Spores brown or yellowish. 



Boletinus porosus Pk. 



Pileus fleshy-viscid when moist, shining, reddish-brown; flesh 

 6 to IS mm. thick; margin thin and even; hymenium porous, 

 yellow, formed by radiating lamellae 1 to 2 mm. distant, branch- 

 ing and connected by numerous irregular veins of less prominence 

 and forming large angular pores. 



Stem lateral, tough, diffused into the pileus, reticulated at the 

 top by the decurrent walls of the tubes, colored like the pileus. 



Spores semi-ovate; pileus 5 to 12.5 cm. broad; stem h to 3 cm. 

 long. 8 to 12 nun. thick. 



Yar. opacus Pk. Pileus dry, ulabrous or subtomentose, not 

 shining, brown or tawny-brown; spores brownish-ochraceous, 

 9 to 11 x 6 to s /x. 



On the ground in damp woods. Frequent. Has been found 

 in woods at Glen Ellyn each year since L896. Our plants belong- 

 to the variety opacus. Edible. 



FOMES. 



Pileus woody-indurate from the first, with a floccose-inter- 

 woven context, covered by a rigid crust: azonate, but at length 

 concentrically sulcate. Perennial; lignatile. 

 1. Plant usually with a lateral stem. . F. lucidus. 



1. Plant senile 2 



2. Pileus, context and pores flesh-color. . /•'. carneus. 



2. Pileus whitish then cinereous 3 



2. Pileus whitish, tawny or fulvous, becom- 

 ing brownish or blackish -1 



:;. ( 'ontext corky-woody, pallid, pores reddish . F. fraxineus. 

 :\. Qontexl corky-woody, and with the pores 



pale-ochraceous F. connatus. 



:;. Context soft, umbrine, pores white then 



fuscous F. applanatus. 



I. Context hard - 1 



I. Context soft 7 



5. Surface of pileus even, pores cinnamon F.fulvus. 



