NEW LABOULBENIALES. 679 



Receptacle 85-125 X 22 fi. Appendage 42 ix. Total length to tip of 

 perithecium 210-315 fx. 



On the superior surface of the abdomen, near the tip, of Psilopa 

 sp., No. ISOSb, (Type), Fayetteville, Arkansas. Tn the same position 

 on Psilopa sp.. No. 2496, Orizaba, Mexico, (Mann). 



This species is clearly distinguished from other forms with four- 

 celled antheridia by the shape and position of the stalk-cell of the 

 appendage, the abrupt external concavity of which causes the in- 

 dividual to appear constricted in this region. The Mexican specimens 

 agree in all respects with those from x\rkansas, which are abundant 

 and in good condition. 



Stigmatomyces Ochtheroideae nov. sp. 



Rather strongly curved throughout and somewhat deeply suffused 

 with dull amber-brown. Receptacle relatively short and slender, 

 straight or slightly curved, the basal cell tapering somewhat below, 

 sometimes finely transversely punctate, distally somewhat broader 

 than the base of the much shorter subbasal cell. Stalk-cell of the 

 appendage overlapping the subbasal cell for about one third of its 

 length, rather short and broad, evenly convex externally, but other- 

 wise not prominent below the insertion of the appendage, which 

 occupies its whole distal surface. Appendage lying sidewise, or with 

 the antheridia turned outward, relatively large, short and compact; 

 consisting of four successively smaller cells; the basal relatively large, 

 short, much broader distally; bearing, like the subbasal, two stout 

 divergent antheridia; the two distal cells bearing one each, and fol- 

 lowed by a seventh terminal one, which bears a small spine near its 

 base. Stalk-cell of the perithecium and the cells above it, more or 

 less uniform, with somewhat rounded outlines; the secondary stalk- 

 cell and the external basal cell above it individually prominent; the 

 whole region compact, becoming distally even broader than the base 

 of the venter through abnormal thickening of the external walls. 

 Venter of the perithecium transversely mottled or granular, hardly 

 if at all inflated, about twice as long as broad, the base of the stout 

 neck abruptly spreading, and not distinguished at its line of junction; 

 the broad stout tip bent rather abruptly inward, subtended externally 

 by a more or less abrupt distal external elevation of the neck; the 

 apex short, stout, somewhat shorter than the tip, not at all distin- 

 guished from it, and tapering to the rather broad, asymmetrical. 



