MICHIGAN ACADEMY OF SCIENCE. 161 



Didymium squamulosum (A. & S.) Fries. 



On old leaves. Common. 

 Didymium melanospermiim (Pers.) Macbr. 



Very common. My specimens were very variable and seemed to run 

 into the following species in such a way as to make the separation 

 of the two species difficult. 



Didyviium minus Lister. 



Common. 

 Didymium .tanfhopus (Ditm.) Fries. 



Common on old leaves. 



Dideimu rcticulatum (Rost.) Morgan. 



On old leaves. 

 Diderma spumarioides Fr. 



Diderma tcstaceuvi (Schrad.) Pers. 

 Common. 



Lepidoderma tigrinum (Schrad.) Host. 



This interesting species was found once only. It is apparently rare. 



Stemonitis maxima Schw. 



Common. 

 Stemonitis Morgani Pk. 



Frequent. 



Stemonitis Smithii Macbr. 



The forms collected included the small form corresponding well to the 

 ones originally described as S. Smithii Macbr. as well as forms 

 which were considered S. microspora by Morgaii. All agree in the 

 small, smooth spores. 



Comatricha irregularis Rex. 



This was found to be quite common on old logs. If it occurs in the 

 collecting grounds in northern Ohio with which I am familiar it is 

 rare, certainly much less abundant than it is in nortliern Michigan. 



Comatricha stemonitis (Scop.) Sheldon. 

 Common and typical. 



Diachea leucopoda (Bull.) Rost. 

 Abundant everywhere. 



Lamproderma arcyrionema Rost. 



The species of Lam])roderma detected were few in number. One col- 

 lection seemed to be //. violaceum but the scanty material was un- 

 satisfactory. 

 6 



