28 THE AGARICACEAE OF MICHIGAN 



11. Stem fleshy or fibrous, sometimes outer rind subcar- 



tilaginous (12) 



11. Stem cartilaginous, mostly throughout (13) 



12. Gills decurrent or broadly adnate, not sinuate at stem : 



Clitocybe. 



12. Gills at length sinuate or emarginate on stem; mostly 



large plants on the ground: Tricholoma. 



13. Gills decurrent, pileus umbilicate: Omphalic/,. 



13. Gills not decurrent (14) 



14. Fruit-body small; pileus thin, tending to remain unex- 



panded and bell-shaped: Mycena. 



14. Fruit-body small, medium or large; pileus usually ex- 



panded when mature, somewhat fleshy: CollyMa. 



15. Fruit-body usually small, toughish, thin, not woody (16) 



15. Fruit-body larger; stem central, eccentric lateral or want- 



ing (17) 



16. Trama of pileus gelatinous : Heliomyces. 



16. Trama fleshy-membranous ; pileus usually small, not 



woody : Marasmius. 



17. Plant woody or corky: (Lenzites). 



17. Plant fleshy-leathery (18) 



18. Gills of the usual kind (19) 



18. Gills longitudinally grooved or split on edge (20) 



19. Edge of gills serrate-torn : Lentinus. 



19. Edge of gills entire: Panus. 



20. Edge of gills split lengthwise: Scliizophyllum. 



20. Edge of gills obtuse, crisped : Trogia. 



Ochre-Spored Agarics 



21. Gills easily separable from the trama of the pileus ; margin 



of pileus involute: Pawittus. 



21. Gills not separating easily from the pileus (22) 



22. Trama of pileus vesiculose; spores globose and echinulate. 



(See Bussula and Lactarius.) 



22. Trama more or less filamentous (23) 



23. Inner veil cobweb-like (cortinate) : gills at length dusted 



dark cinnamon or rusty; terrestrial: Cortinarius. 



23. Inner veil membranous, fibrous or floccose (24) 



24. Annulus present: Pholiota. 



24. Annulus lacking (25) 



25. Stem lateral or wanting: Chepidotus. 



