NEW LABOULBENIALES. 695 



broad, subtruncate, the outer lips more prominent. Spores 28 X 4 /x. 

 Peritheeia 120-135 /x; the venter 65-78 X 40-55 m, the neck 16 ju in 

 diameter. Appendage about 60 X 12 /x. Receptacle 65-98 X 22- 

 26 fjt.. Total length to tip of peritheciuni 200-260 ix. 



On the under surface of the left wing of Parydra pinguis Walk. 

 No. 1805d, Fayetteville, Arkansas. 



This species has been found on a single individual only, and is 

 distinguished by its very stout venter and the evenly incurved neck 

 of the perithecium; the appendage convex on the axis side and the 

 neck of the terminal antheridium abruptly bent in the opposite 

 direction, the wall-cells of the neck more or less distinctly prominent 

 and thus separated by corresponding furrows. The species is evi- 

 dently related to S. 'protrudcns and S. lingulatus. 



Stigmatomyces protrudens nov. sp. 



Receptacle subhyaline, relatively stout and of nearly uniform 

 diameter throughout, the basal cell usually bent and slightly narrower 

 just above the foot; longer, sometimes twice as long as the subbasal. 

 Stalk-cell of the appendage relatively short and irregularly triangular, 

 slightly overlapping the subbasal cell, becoming narrower distally 

 below the insertion of the appendage with which it is concolorous, 

 both being more deeply tinged with dull amber-brown than the peri- 

 thecium and its basal cell region, which are uniformly pale yellowish 

 with slight amber-brown suffusions. Appendage inserted nearly 

 opposite the base of the ascigerous cavity, relatively large and some- 

 times nearly as long as the venter of the perithecium, lying flatwise 

 against it, usually curved throughout, the axis side concave; its axis 

 consisting of three cells; the basal somewhat longer than broad, 

 shorter than the subbasal, both producing two rather large antheridia, 

 the short stout curved necks of which diverge slightly right and left; 

 the upper cell smaller bearing a single antheridium which is united 

 to the terminal one. Stalk-cell of the perithecium subhyaline, small 

 subtriangular, occupying the whole width of the subbasal cell from 

 which it is somewhat obliquely separated. Secondary stalk-cell and 

 basal cells small, nearly uniform, irregularly triangular, concolorous 

 with the perithecium, the external cells slightly prominent. Venter 

 of the perithecium straight, erect, subsymmetrical, but slightly in- 

 flated, somewhat longer, as a rule, than the distal portion, its base not 

 abruptly distinguished from the basal cell region and hardly broader; 



