THAXTER. — ARGENTINE LABOULBENIALES. 159 



tinguished from it by a marked indentation, distally narrower l)elow 

 the small squarish subbasal eell the terminal cell cylindrical, hyaline. 

 Antheridium large, its slender stalk-cell as long as the inflated venter, 

 the neck somewhat shorter than the stalk and venter combined, and 

 slightly curved. Receptacle including foot, 40X23 /x. Appendage 

 17 M- Antheridium 32-35 /i; neck 15 /i, venter 10 ix, stalk-cell 9 fj.. 



Female indindual. Receptacle relatively small, the subbasal cell 

 larger than the basal (without its secondary extension), squarish, 

 distinguished by a deep indentation from the basal cell of the appen- 

 dage which is subequal, tinged with vinous brown, and rounded in 

 form; the rest of the appendage bent strongly to one side, more 

 deeply suffused, small, blunt or pointed, its two cells not distin- 

 guishable. Perithecium relatively large and long, the region below 

 the tip conspicuously suffused with vinous brown, its inner margin 

 concave, the tip hardly distinguished, more faintly suffused, somewhat 

 asymmetrical, as is the hyaline blunt apex; the rest of the perithe- 

 cium slightly inflated above, more faintly suffused, except the narrow 

 hyaline base. Secondary appendages subcylindrical, somewhat less 

 than half as long as the perithecium, two-celled, the basal cells thick- 

 walled, about half as long as the thin-walled blunt terminal cell. 

 The secondary receptacle narrow, horizontal, or nearly so; its four 

 to eight cells bordered by the narrow extension of the basal cell of the 

 receptacle, the one to three erect perithecia and the appendages 

 rising vertically from it. Perithecia 65-70X12-15 m- Spores (in 

 perithecium) 14X1.5 /z. Receptacle, including foot, 18 (i. Sec- 

 ondary receptacle 18-35 /x. Primary appendage 18X9 /u. 



On the legs of Meroneva Sharpi L. A., Temperley, No. 1503, in 

 company with Monoicomyces nigrescens. 



A ver}' clearly marked species which was found but once, and is 

 described from four pairs of mature individuals. 



Dimorphomyces verticalis nov. sp. 



Male individual, relatively small, tinged with blackish brown, the 

 basal cell small, very obliquely separated from the slightly longer 

 narrower subbasal cell which extends downward nearly to its base, 

 and upward to the end of the stalk-cell of the usually single antheri- 

 dium, which is erect, the venter but slightly inflated; with the short 

 rather stout hardly tapering neck abruptly distinguished. Appendage 

 parallel to the antheridium, or but slightly divergent, consisting of 

 three cells: the basal longer than broad, and distally rounded to the 



