153 



io. Lamellae densely crowded, narrow. II. 



Lamellae distant or subdistant, broader. 12. 



11. Stipe long, 5-10 cm., slender, stuffed ; lamellae horizontal. 



L. pergamenus (Swartz) Fr. 

 Stipe short, 2-5 cm., thick, solid ; lamellae arcuate. L. piperatus (Scop.) Fr. 



12. Pileus thin, 3-7 cm., pure white. L. albidus Pk. 

 Pileus thick, larger, reaching 15-20 cm., tinted flesh-color. 13. 



13. Stipe short, 3-4 cm., solid. L. Jlexnosus Fr. 

 Stipe long, 10-15 cm -> hollow. L. platyphyllus Pk. 



Section Dapetes 



1. Milk blue. L. Indigo (Schw. ) Fr. 

 Milk some shade of red or yellowish-red. 2. 



2. Pileus white, dry, velvety. L. salamoneus Pk. 

 Pileus orange, zonate, viscid. L. deliciosus (L. ) Fr. 

 Pileus some shade of gray with blue, green or purple shades. 3. 



3. Milk reddish-brown ; flesh unchanging. L. subpitrpweusW. 

 Milk reddish-yellow ; flesh changing to blue or green. L. Chelidonium Pk. 



Section Russularia 



1. Pileus viscid. 2. 

 Pileus squamulose, tomentose or pruinose, at least when young. 4. 

 Pileus polished, glabrous from the first. 16. 



2. Milk white, changing to yellow. L. thejogahis (Bull.) Fr. 

 Milk white, unchanging. 3. 



3. Pileus 5-8 cm., reddish-brown or nearly cinnamon. L. quietus Fr. 

 Pileus 6-15 cm., pallid, pale yellowish or reddish. L. pallidus (Pers. ) Fr. 



4. Milk white, changing to yellow ; pileus brown. L. stibtomentosus B. & Rav. 

 Milk white, changing to red ;* pileus pallid, pruinose. L. fuliginosus Fr. 

 Milk white, unchanging. 5. 



5. Lamellae distant. 6. 

 Lamellae more or less crowded. 8. 



6. Pileus fuliginous ; lamellae white. L. Gerardii Pk. 

 Pileus yellowish-red or yellowish-brown ; lamellae yellowish. 7. 



7. Pileus small, 4 cm., yellowish-red, pulverulent. L. hygrophoroides B. & C. 

 Pileus larger, 5-10 cm., yellowish-brown, tomentose. L. distans Pk. 



8. Pileus pruinose, not at all pubescent. 9. 

 Pileus at first pubescent, then glabrate. 10. 

 Pileus persistently pubescent or squamulose. 12. 



9. Pileus milky brown then reddish-orange ; stipe orange. L. saccharinus Johns. 

 Pileus dull yellow ; milk very abundant, staining the plant. L. luteolus Pk. 

 Pileus fuliginous, plicate-rugose, 5 cm. or more. L. lignyohis Fr. 

 Pileus fuliginous, plicate-rugose, 2.5 cm.; stipe only 4 mm. thick. 



L. lignyotus tenuipes Pk. 

 * Ladarius lignyohis in Europe is said to have milk turning reddish, but the Amer- 

 ican plants that have been referred to this species do not have this character. 



