THAXTER. — ARGENTINE LABOULBBNIALES. 189 



and externally by a prominent conical outgrowth extendinj^ obliquely 

 upward and outward and narrower toward its blunt, often slightly 

 contracted, apex: the stalk-cell hyaline, shorter than the perithecium, 

 straight or outcurved, often slightly enlarged on the inner side below 

 the perithecium. Subbasal cell of the receptacle triangular, hyaline, 

 the basal cell abruptly cm'ved at right angles, wholly suffused with 

 blackish, but not opaque; oblicpiely related to the subbasal cell, 

 and continued below and just beyond the base of the appendage by an 

 external outgrowth which is not free, even at its tip, being adherent 

 to the basal and subbasal cells of the appendage. The basal cell of 

 the appendage nearly hyaline, bent almost at right angles, and thus 

 turning the rest of the appendage across the stalk-cell of the perithe- 

 cium; the subbasal cell often abruptly narrower, hardly twice as long 

 as broad, bearing distally a few external branches and a large appen- 

 diculate cell, from which arise elongate tapering branches, two or 

 three of Avhich may exceed the perithecium and its stalk-cell in length. 

 Spores 32X3 fi. Perithecium 60-70X20-23 fx, its terminal projection, 

 upper margin 28 ju, lower 40 m; stalk-cell 30-45X12-18 m. Recep- 

 tacle 30-40 /x. Longest appendage 175 m- Total length to tip of 

 perithecium 120-150 ijl. 



On the upper surface of the prothorax near the right margin of a 

 species of Stilicus, Palermo, No. 2012, and Temperley; No. 1932, 

 Tucuman. 



This species, which was met with rarely, always occurred in exactly 

 the same position, and is easily distinguished by its appendiculate 

 perithecium, and the peculiar position of its appendage. 



Corethromyces rhinoceralis nov. sp. 



Perithecium dirty pale brownish amber, a deeper patch of amber- 

 brown involving the subterminal wall-cell on the inner side; subclavate 

 in form, the gradual distal enlargement extending to the subterminal 

 wall-cell; distally curved outward to the subhyaline apex which is 

 slightly cleft, and subtended on the inner side by a long, straight, 

 rather slender unicellular spine-like process which tapers slightly to a 

 blunt apex and projects at right angles; basal cell-region well devel- 

 oped, concolorous, not distinguished from the ascigerous part, nar- 

 rower below where it connects with the rather slender free, subcylin- 

 drical stalk-cell. Receptacle concolorous with the appendage and 

 perithecium, the basal and subbasal cells of about equal length, the 

 subbasal cell half as broad as the basal, except immediately above the 



