54 THE CHICAGO ACADEMY OF SCIENCES 



Glen Ellyn and Winfield. Banks in shade, Pine, Ind., Bertolet 

 and Pepoon. 



Usually solitary, although a cluster containing a dozen speci- 

 mens closely aggregated and distorted by mutual pressure, was 

 found in woods at Glen Ellyn, September, 1900. The pileus is 

 usually partially or wholly covered with dead leaves and dirt 

 which adhered when the young viscid plant pushed its way out 

 of the earth. When old, it is quite dry. The usual size is 7.5 

 to 10 cm. although individuals measuring 15 cm. in diameter 

 have been found. 



Well marked by the densely floccose margin of the pileus. 

 . (Pepoon.) 



Lactarius trivialis Fr. 



Pileus convex then nearly plane, umbilicate or centrally 

 depressed, globose, viscid, somewhat zonate, leaden-gray, livid- 

 cinereous or pale-brown, often with a pink or lilac tint, the thin 

 inflexed margin at first with a grayish pruinosity. 



Lamellae rather narrow, close, thin, adnate, sometimes forked, 

 whitish becoming pallid or creamy-yellow, with dingy-greenish 

 stains where wounded. 



Stem equal or slightly tapering upward, long or short, gla- 

 brous, rarely spotted, hollow, whitish, often tinged with yellow 

 or gray, paler than the pileus. Milk white or pale cream-color, 

 taste acrid. 



Spores yellowish, 7 to 10 p. 



Woods, Glen Ellyn and Winfield. August. Our plants agree 

 with the description except that the lamellae change to brownish 

 where wounded. Pileus 5 to 7.5 cm. broad; stem 5 to 9 cm. long, 

 12 to 24 mm. thick. Spores globose, very slightly echinulate, 

 7 to 8 /A. The flesh of the pileus is grayish under the separable 

 pellicle. 

 . Sandy woods, Millers. August. Harper. 



Lactarius hysginus Fr. 



Pileus convex then nearly plane, umbilicate, red-flesh-color 

 or reddish-brown, the thin margin inflexed, even, viscous. 



Lamellae adnate or subdecurrent, thin, crowded, white then 

 cream-colored or ochraceous. 



Stem stuffed then hollow, smooth, colored like or a little paler 

 than the pileus, sometimes spotted. Spores globose, echinulate, 

 whitish, 7 to 10 /*; milk white, unchangeable, taste acrid. 



Pileus 6 to 10 cm. broad; stem 5 to 10 cm. long, 8 to 16 mm. 

 thick. 



Woods, Millers. August. Harper. 

 Lactarius sordidus Pk. 



Pileus thick, firm, convex and centrally depressed, then nearly 

 plane or subinfundibuliform, subglabrous, slightly viscid when 

 moist, soon dry, pale yellowish-brown, tinged with sordid-green, 

 often darker in the center. 



