NEW DIMORPHOMYCETEAE. 219 



habit irregularly furcate, asym'metrical, the plane of one axis being 

 usually turned at right angles to that of the other: the first axis 

 diverging at an angle of about 45°, or less; the eight to sixteen cells 

 obliquely superposed. Primary appendage short, two-celled, be- 

 coming blackened about the septum and distally: secondary ap- 

 pendages of two forms: short blackened of one or two cells; or much 

 longer, four to six celled, the distal cell distinguished by a slight l)road 

 blackened somewhat constricted area. Perithecia relatively large, 

 much longer than the secondary appendages; the stalk portion stout, 

 rather clearly but not abruptly distinguished ; the ascigerous region sub- 

 symmetrical, the margins convex, progressively darker smoky brown 

 to its junction with the abruptly paler dirty yellowish tip and apex, 

 which are distinguished below by a broad and often very distinct de- 

 pression ; the margins of the tip slightly convex, the short apex slightly 

 distinguished, somewhat asymmetrical as a rule, blunt, the lips often 

 slightly and variably prominent. Perithecia 140-180 X 22-27 /i. 

 Longer secondary appendages 45-95 X 8.5 ju- Secondary receptacles 

 60-95 X 20 M- 



On ApoccUus sp., No. 1581, and 1582, Agua Caliente, Guatemala. 

 (Kellerman). 



Although the material of the female is sufficiently abundant, one 

 male, only, has been examined. The former seems well distinguished 

 from D. verticalis and D. Myrmedoniae by its furcate habit, long 

 stout multicellular secondary appendage, and more specialized peri- 

 thecia. The position of the second secondary appendage, which 

 arises from the subbasal cell and which developes sidewise and is 

 viewed edgewise, makes it almost impossible to determine the exact 

 character of the small dark primary appendage which it subtends. 

 It is also nearly allied to D. vulgatissimiis of Spegazzini, from which 

 it differs in the character of its secondary appendages and in the 

 relative position and character of its secondary receptacles. 



Dimorphomyces brevirostris nov. sp. 



Male individual yellowish, becoming tinged with brownish, a deep 

 blackish brown suffusion in^•olving a part, or almost the whole, of the 

 basal cell, and more or less of the posterior margin of the rest of the 

 receptacle; which consists of two or three cells, according as one or 

 two antheridia are developed: the basal cell rather long and narrow, 

 forming a rather well developed stalk, its narrow termination extend- 



