140 



Peck. Five others are supposed to be exclusively American 

 while forty are common to this continent and Europe. 



Key to the Sections of the Genus 



1. Stipe central or nearly so. 2. 

 Stipe excentric or lateral (none known from North America). 



Sec. Pletjropus. 



2. Milk at first white, sometimes changing color on exposure. 3. 

 Milk bright- colored (red, blue, etc.) from the first. Sec. Dapetes. 



3. Lamellae not changing color with age, not pruinose ; milk usually acrid 



(Sec. Piperates). 4- 



Lamellae pallid, then darker and pruinose ; milk usually mild. 



Sec. Russularia. 



4. Pileus viscid, at least when young. 5- 

 Pileus dry, naked or clothed, not shining. Subsec. Piperati. 



5. Margin of pileus naked from the first, pelliculose. Subsec. Limacini. 

 Margin of pileus at first tomentose. Subsec. Tricholomoidei. 



Subsection Tricholomoidei 



1. Milk white, soon changing to yellow. 2. 

 Milk white, unchanging. 6. 



2. Stipe scrobiculate-spotted ; pileus yellow, depressed. L. scrobiculatm (Scop.) Fr. 

 Stipe not spotted. 3- 



3. Pileus large, 10-15 cm., deeply depressed or infundibuliform, glabrate. 4. 

 Pileus smaller, 4-10 cm., convex to subplane, villous. 5- 



4. Stipe villous. L. resimus Fr. 

 Stipe glabrous. L. regalis Pk. 



5. Pileus dingy flesh-color to pale reddish bluff. L. cilicioides Fr. 

 Pileus at first white, dirty yellow when old. L. cilicioides albus Pk. 



6. Pileus white or whitish. 7- 

 Pileus brownish or olivaceous. 9- 



7. Pileus azonate, glabrous, margin soon naked. L. subinsulszts Pk. 

 Pileus more or less zoned, clothed. 8. 



8. Pileus white to pale ochraceous, tomentose. L. tormiiiosus (Schaeff. ) Fr. 

 Pileus white, zoned and spotted with red, at first floccose. 



L. controversus (Pers. ) Fr. 



9. Pileus 6-20 cm., plane, flat; stipe tapering downward. L. turpis Fr. 

 Pileus 4-8 cm., convex, center depressed ; stipe tapering upward. L. sordidus Pk. 



Subsection Limacini 



1. Pileus sordid white ; milk changing to lilac. 2. 

 Pileus some shade of yellow ; milk unchanging. 3. 

 Pileus reddish flesh-color becoming paler ; milk unchanging. L. hysginus Fr. 

 Pileus some shade of gray ; milk unchanging. 5. 



2. Pileus azonate, thin, fragile, 5-8 cm. L. uvidus Fr. 

 Pileus obscurely zonate or concentric-spotted, larger. L. iividus magnus Pk. 



