THAXTER. — ARGENTINE LABOULBENIALFS. 193 



Laboulbenia Lathropini nov. sp. 



Receptacle relatively stout and small, cells I and II faintly suffused, 

 subequal in length; the latter broader, sometimes longer; the rest 

 of the receptacle and the perithecium deeply suffused with dirty 

 olivaceous brown; cells III and IV subequal; the upper angle of cell 

 V free between the perithecium and the slightly oblique insertion-cell, 

 which is thick but rather small. The simple outer appendage enor- 

 mously elongated, distally hyaline, the cells several times longer than 

 broad, all similar; the first three or four somewhat shorter than the 

 rest; the basal cell of the inner appendage very small, bearing an 

 antheridial branch consisting of one to two small cells, terminated 

 by one to two antheridia, one of which may be replaced by a long 

 simple sterile branch. Perithecium relatively large, not wholly free, 

 slightly and evenly inflated; the wall-cells strongly spiral and marked 

 by fine irregularly parallel lines; the tip deeply suffused, the lip-edges 

 hyaline, subequal, the apex sulcate and turned strongly inward. 

 Spores 75X8 ^. Perithecium 150-175X45-50 tx. Receptacle 120- 

 155 /x. Longest appendage 900X 16 /x at base. Total length to tip 

 of perithecium 900X 16 ix. 



On the upper surface of the abdomen of Lathropinus fulvipes Er., 

 No. 1975, Llavallol. 



A species of the simpler "polyphaga" type, most nearly allied to 

 L. Ocdodadyli, and distinguished by its enormously elongated outer 

 appendage and spirally twisted, longitudinally striate wall-cells. 

 The host was found rarely in decaying wood. 



Laboulbenia funerea Speg. 



This form which is very abundant on species of Anaedus in the 

 vicinity of Buenos Aires, especially in the woods at Santa Catalina, 

 is, in my opinion, best regarded as a variety of L. polyphaga. It 

 is characterized by its small size, averaging about 175 /x to the tip 

 of the perithecium, the receptacle being usually rather short, about 

 95-100 ju, although cell II is occasionally considerably enlarged. 

 Cell I is always hyaline, cell II often so, though frequently in- 

 volved by the characteristic blackish olive-brown suffusion of the 

 rest of the receptacle, which is concolorous with the perithecium 

 except for a small hyaline patch usually present below the insertion- 

 cell. The outer appendage is usually furcate above its subbasal 

 cell, the two branches distally hyaline and tapering; the small basal 



