270 PROCEEDINGS OP THE AMERICAN ACADEMY 



cell (6) by a very oblique, almost vertical septum ; from cell (3) by 

 a short, horizontal septum; cell (6) twice as broad as long, its upper 

 and lower septa parallel : cell (7) nearly obselete ; cell (8) rather 

 large, triangular. Spores of the usual type 50 X 5 fi. Perithecia 

 100-120 X 40-50 fi. Pseudoparaphyses, maximum 180 [x. Total 

 length to tip of perithecium 200-220 fjL • greatest width 55 /x. 



On Platynus extensicollis. Connecticut. 



Occurs in small numbers always on the legs of its host, its most 

 noticeable character being the curvature towards one another of the 

 pseudoparaphyses and the apex of the perithecium. A rather rare 

 species, described from thirty-two mounted specimens. 



Note. — Types of all the species of Laboulbeniaceae described by the writer 

 are contained in Herb. R. Thaxter and Cryptogamic Herbarium, Harvard 

 University. 



