CONTRIBUTIONS FROM THE CRYPTOGAMIC LABORATORY OF 

 • HARVARD UNIVERSITY. — L. 



PRELIMINARY DIAGNOSES OF NEW SPECIES OF 

 LABOULBENIACEAE. —V. 



By Roland Thaxter. 



Presented May 14, 1902. Received May 15, 1902. 



Dimeromyces Forficulae nov. sp. 



Male individual. Receptacle consisting of three superposed cells, the 

 upper distinguished by a well-defined black septum from a short two- - to 

 three-celled terminal appendage, the subbasal septum of which is also 

 blackened ; the subbasal cell of the receptacle producing a suberect, 

 short-stalked, rather long and narrow antheridium ; the neck relatively- 

 broad, blunt, about as long as the stalk and venter. Total length to tip 

 of antheridium 60 p : the antheridium, including stalk, 28-30 X 7-8 fi. 



Female individual more or less tinged with purplish-brown, especially 

 the body of the perithecium. Receptacle consisting of usually five cells 

 obliquely superposed, with the exception of the uppermost, successively 

 smaller from below upward, the series more or less strongly curved out- 

 ward from the male ; the subbasal cell bearing a simple differentiated 

 appendage, its basal cell more or less geniculate and separated from the 

 basally inflated, tapering, brown, five- to six-celled distal portion by a 

 blackish constriction ; the cell next above it producing the single peri- 

 thecium : the next a simple cylindrical slightly tapering appendage with 

 a black subbasal constricted septum ; the terminal cell bearing terminally 

 a short, simple, few-celled primary appendage, distinguished by a con- 

 stricted black basal and a pale subbasal septum, and laterally a similar 

 appendage distinguished by a subbasal blackish constricted septum. 

 Perithecium rather elongate, subclavate or subfusoid, the stalk not 

 distinguished from the body of the perithecium, and sometimes show- 

 ing irregular septa; the tip often somewhat abruptly distinguished, blunt, 

 slightly asymmetrical. Spores about 35 X 3.5 p. Perithecia, including 



