Pileus toru into scales Leptonia 



Pileus papillose, sub-caiiip;uiuliite. 



(rills iiieiiibraimceoiis, persistent Nolanrn 



Gills sub-deliquescent IJOLUri'IdS 



III. Spores brownish, sometimes rusty, retlilisli or yelldwish hrnwn. — Derinini. 



* Without cartilaginous bark. 



+ Stem eoutral. 



J With a ring. 



King continuous PhoUota 



King arachnoid, like a spider's web filamentous or evanescent. 



Gills adnate terrestrial (JOKTINAKIUS 



Gills decurrent, or acutely aduate, mostly epiphytal, 



Flammula 

 X Without a ring. 



With rudimentary volva Acetabularia 



Without a volva. 



Gills adhering to the hymenophore, and sinuate. 



Cuticle fibrillose or silky Inocyhe 



Cuticle smooth viscid JTeheloma 



Gills separating from the hymenophore, and decurrent, 



PAXILLUS 

 tStem lateral or absent , CrepidolUH 



* With cartilaginous bark. 



Gills decurrent Tubaria 



Gills not decurrent. 



Margin of pileus at first incurved Naucoria 



Margin of pileus always straight. 



Hymenophore free Pluteolus, 



Hymenophore confluent Galei'a 



IV. Spores purple, sometimes brownish purple, dark purple, or dark brown. — Pratelhe. 



* Without cartilaginous bark. 



t Hymenophore free. 



J With a volva Chlionia 



J Without a volva Psalliola 



+ Hymenophore confluent. 



Veil normally ring shaped on the stem Stropharia 



Veil normally adhering to the margin of the pileus Hypluiloma 



* With cartilaginous bark. 



Gills decurrent Deconica 



Gills not decurrent. 



Margin of pileus at first incurved Psiloxybe 



Margin of pileus at first straight Psdthyra 



V. Spores black or nearly so. — Coprinarii. 



Gills deliquescent COPKINIJS 



Gills not deliquescent. 



Gills decurrent GOMPHIDIUS 



Gills not decurrent. 



Pileus striate P.mthyrdla 



Pileus not striate PcdkvoIus 



In the Friesiau classification which, with modifications, has prevailed 

 for many years among- mycologists, the c/enus Agaricus included in its 

 subgenera the greater part of the species of the order Agaricini. The 



