52 



ASCOMYCETES 



[cii. 



trichogyne o, 



oogonium i cell, 



never septate, 



antheridium attached. 



trichogyne o, 



oogonium i cell, 



septate after fert., 



antheridium attached. 



trichogyne i cell, 



oogonium i cell, 



septate after fert. , 



antheridium attached, 



trichogyne i cell, 



oogonium icell, 



never septate, 



antheridium attached, 

 large. 



PLECTOMYCETES 



SACCHAROMYCETACEAE 

 ENDOMYCETACEAE 



Sphaerotheca 

 ERYSIPHACEAE 



GYMNOASCACEAE 



! I 



ASPERGILLACEAE 



LOWER PYRENO- 

 MYCETES 



Ascodesmis 

 I 



CO 



U 

 H 

 W 



Pyronema 



PEZIZACEAE 





incomplete develop- 

 ment of septate 

 type with antheri- 

 dium set free. 



o 



> 



LABOULBEN'IALES 



complete development 

 of septate type 

 with antheridium 

 set free. 



Lachnea stercorea 



I 

 Lachnea cretea Rhizina 



I ! 



ASCOBOLACEAE 



Collema pulposum 



LICHENES 

 HIGHER PYRENOMYCETES 



O 

 U 



p 



The dotted lines indicate possible and the continuous lines rather more probable relationships. 



