TIIAXTER. — ARGENTINE LABOfLHENIALES. 187 



On head and labium of Stiliciis sp., No. 19G8H, Palermo. 



This small species was found only once in the park at Palermo but 

 was also obtained on a similar host at Corral, Chile, No. 1902. It is 

 allied to C. Stilici, from which it differs in the form of its perithecium 

 and receptacle, as well as in the character of the outgrowth from the 

 latter. 



Corethromyces sigmoideus nov. sp. 



Axis from tip of perithecium to foot, describing an even sigmoid 

 curve, the lower cur\ature much shorter. Perithecium strongly 

 curved outward, translucent amber-brown; the basal cell-region 

 concolorous, often slightly distinguished from the ascigerous part, the 

 basal cells well developed and triangular; the apparent apex formed 

 by a blunt outgrowth directly continuous with the ascigerous portion, 

 of which it forms the bluntly rounded slightly asymmetrical termina- 

 tion; the apex proper having its pore lateral in position and hardly 

 distinguishable: stalk-cell but faintly- suffused, broader distally, and 

 distinguished from the basal cell-region by a slight constriction; 

 abruptly curved near the base, the axis of which is directly con- 

 tinuous with the subbasal cell of the receptacle. The' latter slightly 

 suffused, relati\ely large, extending on the perithecial side downward 

 nearly to the foot, and obliquely separated from the externally deeply 

 suffused basal cell; which is of about the same diameter throughout, 

 including its upward extension which, lying beside the subbasal cells, 

 extends beyond the base of the first cell of the appendage to which it 

 is adherent, forming a rounded prominence; the upgrowth larger 

 than the basal cell proper, and not distinguished from it. The basal 

 cell of the appendage subelliptical, concolorous with the subbasal cell 

 of the receptacle, its long axis nearly at right angles to that of the rest 

 of the appendage which is curved across the stalk-cell of the perithe- 

 cium; the subbasal cell small, flattened or rounded, bearing on its 

 inner surface a smaller ramiferous cell, and distally a much larger one, 

 often several times longer than broad, and bearing distally numerous 

 branches ; the latter more or less branched, all the branches tapering 

 somewhat, slightly suffused below^ hyaline above; the two or three 

 longer ones curved downwards. Perithecia 70-85X23-27 fx: stalk- 

 cell 60X 18 /x. Receptacle including foot 40 (jl. Total length to tip 

 of perithecium 135-170 /x. Spores 20 X 3 /jl. 



On the superior right lateral margin of the prothorax of Sfilicus 

 elcgans Lynch. Llavallol, No. 1994. 



