Murrill: Dark-spored Agarics 



201 



Pileus 10-15 cm. broad. 

 Pileus becoming yellowish. 

 Spores 4-5 fx, long. 

 Spores 5-7 fx long. 



Spores very broadly ellip- 

 soid, about 7 x 5.5 jtt. 

 Spores 5-7 x 3-4 fi. 

 Pileus some shade of gray, brown, or reddish- 

 brown, at least on the disk or with age. 

 Pileus glabrous or fibrillose ; sometimes 

 slightly squamulose in A. brunnescens 

 and A. micromegethus. 

 Pileus about 2-5 cm. broad. 



Stipe 1-2.5 cm. long; context not 



changing color when cut. 

 Stipe 2.5-4 cm. long; context becom- 

 ing blackish when cut. 

 Stipe 5-10 cm. long; context be- 

 coming reddish when cut. 

 Pileus 5-20 cm. broad. 

 Stipe 2.5-5 cm. long. 



Context whitish, unchanging. 

 Context whitish, quickly redden- 

 ing when cut. 

 Stipe 10-15 cm. long. 

 Pileus distinctly squamulose or echinate. 

 Pileus 1-4 cm. broad. 

 Pileus echinate. 

 Pileus squamulose. 



Species growing in leaf-mold in 

 woods. 



Species growing on manure in 

 the open ; pileus usually quite 

 umbonate. 

 Pileus 5—18 cm. broad. 



Context becoming distinctly reddish 

 when wounded. 

 Stipe 8-15 mm. thick. 

 Stipe 4-8 mm. thick. 



Pileus becoming reddish- 

 brown when bruised or on 

 drying. 



Pileus not changing as 

 above. 



Context not becoming distinctly red- 

 dish when wounded. 

 Stipe 2-6 cm. long. 



Pileus with scattered fibril- 

 lose scales. 

 Pileus with spot-like scales 

 at the center. 

 Stipe 6-15 cm. long. 



Stipe 4-8 mm. thick. 

 Stipe 1-1.5 mm. thick. 



Annulus simple ; hy- 

 menophores gregari- 

 ous. 



Annulus double ; hy- 

 menophores cespitose. 



11. A. floridanus. 



12. A. cretacellus, 



13. A. pratensis. 



14. A. sylvicola. 



15. A. micromegethus. 



16. A. argenteus. 



17. A. rutilescens. 



18. A. brunnescens. 



19. A. halophilus. 



20. A. magniccps. 



21. A. echinatus. 



22. A. diminutivus. 



23. A. approximans. 



24. A. haemorrhoidarius. 



25. A. rubribrunnescens. 



26. A. eludens. 



8. A. campester. 



27. A. Sterlingii. 



28. A. placomyces. 



29. A. sylvaticus. 



30. A. subrufescens. 



