240 



A Monograph of the Erysiphaceae 



latae, 1 5-20 x 12 mmm. Autumno. In pileo Arrhcniae aiiriscal- 

 piimi Fr. in sylvls umbrosis mixtis. Val di Sole. Podosphaera 

 dandcstinac Lev. affinis/' Saccardo gives the same description 



and adds 



a 



ascis 



in quoque perithecio pluribus. 



Etsi 



matrix tarn absona, species generis optima videtur." 



Quelet 



figure a perithecium is shown with appendages which certainly 



^spliaera. On the other hand, the 



recall those of the genus MicrospJiaera. 

 echinulate yellowish spores, if these are correctly described, would 

 be anomalous characters. Overlooking these spore characters, 

 the suggestion may perhaps be made that perithecia of some spe- 

 cies o{ MicrospJiaera, c. g,, M. alni, may have accidentally become 

 attached to the pileus of the Arrhcnia. Abbe Brcsadola informs 

 me that unfortunately the type specimen is lost. 



