Rigid and brittle RUSSULA
11. Waxy HYGROPHORUS
5. Stem lateral or absent _Pleurotus_
4. With cartilaginous bark
12. Gills adnate _Collybia_
12. Gills sinuate _Mycena_
12. Gills decurrent _Omphalia_
1. Plant tough, coriaceous or woody
13. Stem central.
14. Gills simple MARASMIUS
14. Gills branched XEROTUS
13. Stem lateral or wanting
15. Gills toothed LENTINUS
15. Gills not toothed PANUS
15. Gills channelled longitudinally or crisped TROGIA
15. Gills splitting longitudinally SCHIZOPHYLLUM
15. Gills anastomosing LENZITES

II. Spores rosy or salmon color--Hyporhodii
16. Without cartilaginous bark
17. Hymenophore free
18. With a volva _Volvaria_
18. Without a volva
19. With a ring _Annularia_
19. Ringless _Pluteus_
17. Hymenophore confluent, not free
20. Stem central
21. Gills adnate or sinuate _Entoloma_
21. Gills decurrent _Clitopilus_
20. Stem lateral or absent _Claudopus_
16. With cartilaginous bark
22. Gills decurrent _Eccilia_
22. Gills not decurrent
23. Pileus torn into scales _Leptonia_
23. Pileus papillose, sub-campanulate.
24. Gills membranaceous, persistent _Nolanea_
24. Gills sub-deliquescent BOLBITIUS

III. Spores brownish, sometimes rusty, reddish or
yellowish brown.--Dermini.
25. Without cartilaginous bark.
26. Stem central.
27. With a ring.
28. Ring continuous _Pholiota_
28. Ring arachnoid, like a spider's
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