214 PROCEEDINGS OF THE AMERICAN ACADEMY. 



slightly divergent when mature, consisting of a variable number 

 (eight to twelve) of superposed cells, the series tapering distally, some 

 or most of the cells cutting off one or two small cells on the inner side, 

 sometimes also on the outer side from which branches arise as well as 

 antheridia (?) which are irregularly flask-shaped, single and sessile or 

 borne one or two together on short branchlets; the sterile branches 

 usually broken and not copiously developed. Perithecium nearly 

 straight, its axis usually continuous with that of the receptacle, a 

 venter neck and tip more or less clearly distinguished, the latter bent 

 very slightly inward, the apex blunt and usually becoming minutely 

 six-papillate; the outer, lower wall-cell slightly prominent below the 

 neck; the two upper basal cells extending upward beside the venter, 

 the stalk-cell short and subtriangular. Perithecium 140-200X38- 

 44 n, smallest 100X25 /x, stalk-cells and lower basal cells 20 ^l. Spores 

 in perithecium 35X3.5 ix. Receptacle average 200 /x. Appendage 

 60-100 /I. Total length to tip of perithecium about 325 ^x. 



On the abdomen of Coproporns nitilus Er.; Tucuman, No. 1933, 

 P. Spegazzini. Also from Los Amates, Guatemala, No. 1614 (Keller- 

 man). 



The material of this species is not in very good condition and it is 

 difficult to determine the character of the appendages and antheridia 

 from them. The Guatemalan material includes only three specimens 

 in which the perithecia are mature, and in these the papillation of 

 the apex is either indistinct or lacking; but, although the individuals 

 are somewhat larger, the perithecia more divergent, and the cells of the 

 receptacle shorter and broader than the Tucuman material, the two 

 forms seem identical. 



Autoicomyces bicornis nov. sp. 



Pale yellowish with a smoky tinge, deepest at the base of the peri- 

 thecium. Basal and subbasal cells of the receptacle rather large, of 

 about equal length. Appendage usually straight, somewhat diver- 

 gent, comparatively slender; consisting of six or more superposed cells, 

 and bearing a few small branchlets. Perithecium nearly straight 

 externally, its inner margin convex; the tip lying in the fork formed 

 by two outgrowths which arise symmetrically just below it from the 

 wall-cells on either side; the outer shorter, rather closely septate, 

 tapering to a blunt apex, and curved inward ; the inner two or three 

 times as long, usually septate only at the base, curved away from the 

 perithecium and tapering to a blunt point. Perithecium 95-1 lOX 



