278 H. MARSHx\LL WARD. 



o 1. — Tremellini — i Hymenomycetes. 

 Saccharomycetes — §, S' I basteromycetes. 





I 



3 — Chytridese — Protomycetes — Ustilaginese. 

 Zygomycetes— o 



o — Saprolegnise. 



The details may be filled in according to what has been said. 



On comparing this diagram with that offered by Brefeld, it 

 will be noticed that there is some agreement in general 

 between them ; it is chiefly in points of detail that the differ- 

 ences appear. Both the authorities agree as to the serial 

 arrangements (on the whole) of the main groups ; but Brefeld, 

 wliile also placing the Tremellini as derived from Uredinese, 

 seeks another origin for the other Basidiomycetes. When 

 we notice De Bary's caution in not deriving the Uredineae 

 from any particular point in tbe huge ascomycetous series, we 

 may allow that he and Brefeld do not differ much in opinion as 

 to their origin — the latter simply places their origin more 

 definitely lower down in the main series, a fact which would 

 possibly be of significance if we were inclined, after all, to 

 regard the similarities between ^Ecidiomycetes and Cys- 

 topus. 



The chief motive. in Brefeld's scheme is afforded by his 

 peculiar views on Pycinidia, and on the relationships of the 

 Entomophthorese. He regards the point wliere the main 

 series of higher Fungi developed pycnidia, as the point whence 



