200 PROCEEDINGS OF THE AMERICAN ACADEMY. 



the base of cell I hyaline, the distal part more deeply suffused than the 

 rest of the receptacle; cell II somewhat longer anteriorly than cell I, 

 cell IV somewhat obliquely prominent below the insertion-cell, 

 which is relatively narrow and thick: appendages slender, the basal 

 cell of the outer very slightly longer than broad, somewhat larger than 

 that of the inner, becoming deeply suffused with age, bearing a single 

 slightly divergent branch, the slightly smaller basal cell of which bears 

 two to three branchlets distally, its deep external suffusion continu- 

 OU& with that of its short slender outer branchlet, its one or two inner 

 branchlets radially placed, simple hyaline erect, extending to or above 

 the tip of the perithecium: basal cell of the inner appendage bearing 

 one or two branches, sometimes once branched, hyaline, erect, similar 

 to the adjacent branches of the outer appendage. Perithecium bent 

 inward, becoming rich brown with a slight olivaceous tinge when fully 

 mature; the base, above the basal cells, sometimes rather abruptly 

 distinguished and slightly paler; the tip rather long, broad, hardly 

 distinguished, sometimes bent very slightly outward; the apex broad, 

 blunt, often symmetrically rounded; or the lips slightly prominent, 

 subhyaline and subtended by a deeper shade on the inner side. Spores 

 70xi3M- Perithecium 135X35 to 210X55 m, average 175X42 ;u. 

 Receptacle 235-335X50-70^1. Longest appendage 200 /z. Total 

 length to tip of perithecium 300-500 /x. 



On " Argutor Bonariense Dej." Usually growing in a single group 

 not far from the base of the outer margin of the left elytron, but occur- 

 ring less frequently on the legs and inferior surface. Lla vallol, No. 2032 ; 

 Temperley, No. 1512; Buenos Aires, No. 1962; La Plata, No. 1460. 



A species usually distinguishable with a hand lens from its large 

 size and localized position on the left elytron. In one group of indi- 

 viduals examined there is some variation from the type described, 

 cell I being short, cell II much enlarged and separated from cell VI 

 by a conspicuous indentation, so that the receptacle is subgeniculate; 

 the tip is more prominently distinguished and bent inward, the lips 

 broader and more prominent. The variations in size are considerable 

 and almost straight individuals of the normal type sometimes occur. 



Laboulbenia lutescens nov. sp. 



" Laboulbenia fumosa," Spegazzini, Fungi Chilenses, p. 135. 



Receptacle more or less deeply, though not uniformly suffused with 

 clear olive brown, especially along the margin below the appendages, 

 the basal cell small, hyaline below; cell II but slightly longer; cells 



