Series i. 
Pileus distinct from the fleshy stem. 
Plant furnished with a volva. Tribe 1. Volvae. 
Plant without volva, ring present. Tribe 2. Annulae. 
Plant with neither volva or ring. Tribe 3. Pxannulae. 
Series 2. 
Pileus confluent and homogenous with the 
fleshy stem. 
Plant with a ring. Stipe central. Tribe 4. Armillae. 
Plant without a ring. Gills attached with a sinuate tooth. Stipe central. 
Tribe 5. Dentae. 
Plant without ring. Gills decurrent. Stipe central. Tribe 6. Clivae. 
Stipe excentric or pileus laterally attached. Tribe 7. Hxcentrae. 
4 
Series 3. 
Stipe cartilaginous. 
Gills not decurrent. Pileus explanate, margin at first involute. 
Tribe 8. Explanae. 
Gills not decurrent. Pileus campanulate, margin at first straight. 
Tribe 9. Campanulae. 
Gills decurrent. Pileus umbilicate. Tribe 10. TJmbilicae. 
19 
