241 
3. Endopyrenium, Chroolepus. 
4. Endocarpon, - 
5. Pyrenothamnia, “ 
LICHENES IMPERFECTI. 
1. Thamnolia. Protococcus. 
2. Siphula, etc. 
The following diagrams show the probable phylogenetic rela- 
tionships of the genera of some of the families. The remaining 
families are not sufficiently well understood to indicate this rela- 
tionship. 
Pleurocybe Sphaerophoron 
Coniophyllum Acrocyphus Tholurna 
Pyrgillus —_——Acolium__Tylophoron 
[Mycacolium ] 
Acoliacet. 
Argopsis 
Cladonia Stereocaulon Thysanothecium 
