NEW LABOULBENIALES. G89 



Bocas del Toro, Panama, (Rorer) ; No. 2053, Williamsfield and No. 

 2044, Clarkstown, Jamaica, W. I. 



This appears to be a very rare species, since it has been obtained in 

 only three instances among the very large number of hosts examined 

 from the West Indian region. The appearance of its venter recalls 

 that of the simpler forms of S. constrictus, but its form is otherwise 

 different and the appendage is of quite another type. 



Stigmatomyces ambiguus nov. sp. 



Nearly straight to the distal end of the venter, above which the 

 distal portion of the perithecium is more or less strongly curved or 

 bent inward. Receptacle more or less uniform throughout, slightly 

 broader at the horizontal septum; the basal cell nearly hyaline, 

 slightly narrower below; the subbasal distinctly suffused, shorter or 

 slightly longer than the basal. Stalk-cell of the appendage more 

 deeply suffused with dull amber-brown, concolorus with the uniformly 

 suffused perithecium, its base slightly overlapping the subbasal cell, 

 rather short and broad, prominently rounded below the rather broad 

 insertion. Appendage relatively large and stout, about as long as the 

 venter consisting of four successively slightly smaller cells; the basal 

 rather large, somewhat longer than broad, concolorous with the stalk- 

 cell; the three lower cells bearing each two antheridia, the fourth a 

 single one followed by a terminal one; the antheridia rather large with 

 prominent nearly straight necks turned outward, or somewhat side- 

 wise, and divergent. Stalk-cell of the perithecium rather small, 

 rounded distally, its base straight and oblique; the cells above it 

 but slightly smaller, more or less uniform, somewhat less deeply 

 suffused than the rest of the perithecium. Venter straight, its surface 

 indistinctly transversely irregularly granular-punctate, nearly symme- 

 trical, but slightly inflated: neck about as long as the venter, curved 

 or bent inward, concolorous, less conspicuously granular-punctate; 

 stout, but clearly distinguished above its slightly but abruptly spread- 

 ing base; somewhat broader distally below the slightly but abruptly 

 distinguished short tip, which is not distinguished from the much 

 shorter apex; the margins of the two slightly and nearly symmetrically 

 convex; the apex broad, subtruncate and slightly oblique distally, 

 the lips hardly distinguished. Spores about 35 X 3.5 n. Perithecia 

 140-155 n, the venter 60-70 X 30-32 n. Receptacle 88-105 X 21 m- 

 Appendage 60 X 15 /jl. Total length to tip of perithecium 210-280 m- 



