232 THAXTER. 



On Parasitus sp. and Mdcivchclcs sp. No. 2493, M. C. Z. (Mann. 

 Collection). Orizaba, Mexico. 



This well marked species is more nearly allied to Paoli's D. mucrona- 

 ius and D. viuticus, but is so clearly distinguished by its three celled 

 primary appendage, as well as by nvmierous other characters that 

 further comparison is vmnecessary. The two appendages form the 

 arms of a more or less symmetrical Y, in the angle of which the peri- 

 thecium rests. 



Dimeromyces subuliferus nov. sp. 



Male individual h\'aline; the receptacle consisting of two \ery 

 obliquely superposed cells, the upper slightly larger and corresponding 

 to the subbasal cell, as well as to the subbasal cell of the terminal 

 appendage, which is separated from it distally by a slight constriction 

 and dark septum, and consists of two cells; the upper subulate, its 

 extremity straight, recurved, or bent. Venter and small stalk-cell 

 of the antheridium separated from the subbasal cell by a curved 

 oblique septum, erect; the brown neck clearly defined, rather long 

 and usually bent across the distal portion of the appendage. Total 

 length to tip of antheridium, including foot, 50-55 X 10 /x. 



Female individual becoming sufl'used with blackish brown above, 

 the basal cell of the receptacle hyaline, forming a more or less well 

 defined stalk on which is borne the compact and somewhat rounded 

 abruptly broader upper portion, which is composed of usually three- 

 smaller somewhat obliquely superposed nearly median cells lying 

 below the base of the single perithecium, which separate a correspond- 

 ing number of obliquely superposed, closely united, externally promi- 

 nent cells anteriorly, each bearing a single simple terminal portion; 

 which is distinguished by a dark septum and constriction, is three 

 celled, the two lower cells subequal stout and about as broad as long, 

 the terminal one forming a slender prolongation which usually is 

 recurved inward and lies against the surface of the receptacle; the 

 remainder of the receptacle consisting of three very obliquely super- 

 posed larger cells lying on the opposite side of the perithecium, the 

 lower of which is smaller and gi^•es rise to the latter: the middle one 

 longer and narrow, its upper two thirds or less united to the perithe- 

 cium, its upper third or more separated by a septum, and terminated 

 by a rigid subulate appendage which is two-celled, its basal cell 

 partly hyaline or translucent, strongly inflated, distinguished below 

 by a blackened septum and constriction, the upper portion tapering 



