56 THE CHICAGO ACADEMY OF SCIENCES 



Spores subglobose, 7.5 to 9 /x.. Pileus 5 to 12.5 cm. broad; 

 stem 2.5 to 5 cm. long, 12 to 20 mm. thick. 



Dry places, especially under pine trees. (Peck.) 

 Calumet Heights, Millers and Glencoe. August and Septem- 

 ber. At Millers it occurs in mixed woods, both upon dry 

 ground and in moist swamp borders. 



Lactarius theiogalus Fr. 



Pileus thin, convex then depressed, at length infundibuliform, 

 even, smooth, viscid, tawny-reddish, shining when dry* rondos?; 

 flesh whitish, milk white then changing to sulphur-yellow, taste 

 slowly acrid. 



Lamellae adnate or decurrent, close, pallid then reddish. 



Stem stuffed then hollow, equal, even, concolorous with the 

 pileus. 



Spores yellowish, subglobose, 7.5 to 9 /x. Pileus 5 to 12.5 cm 

 broad; stem 2.5 to 7.5 cm. long, 16 to 18 mm. thick. 



Open woods, Glen Ellyn. August. Pileus 6 to 7.5 cm. broad; 

 stem about 6 cm. long. The pileus changes from reddish-tawny 

 to ochraceous-tawny when parting with its moisture. 



Lactarius fuliginosus Fr. 



Pileus firm, becoming soft, convex, plane or slightly depressed, 

 even, dry, zoneless, dingy-cinereous or buff-gray, appearing as if 

 covered with a dingy pruinosity, the margin sometimes wavy or 

 lobed. 



Lamellae adnate or subdecurrent, subdistant, whitish then 

 yellowish,, becoming stained with pink-red or salmon color where 

 wounded. 



Stem equal or slightly tapering downwards, firm, stuffed, 

 colored like the pileus; spores globose, yellowish, 7.5 to 10 /*.; 

 milk white, taste tardily and sometimes slightly acrid. 



Pileus 2.5 to 6 cm. broad; stem 2.5 to 5 cm. long, 6 to 12 mm. 

 thick. 



Grassy places in open woods, Riverside. July. 



Lactarius hygrophoroides B. & C. 



Pileus convex, at length plane, pulverulent, yellowish-red. 



Lamellae very distant, decurrent, yellowish, the interstices 

 rugose. < 



Stem not 2.5 cm. high, 8 mm. thick, of the same color as the 

 pileus. Pileus 3.5 cm. across. This species has somewhat the 

 habit of L. volemus. 



Open woods, Glen Ellyn. August. Pileus dry, rugose- 

 reticulated, at length subinfundibuliform, orange-tawny; lamellae 

 creamy-white, some of them forked; stem smooth, tapering down- 

 wards; milk white, mild, unchangeable. Spores globose, slightly 

 rough, 10 /A. 



