THAXTER. — NEW LAB0ULBENIACEJ3. 207 



the basal one subtriangular and blackish, the rest hyaline or yellowish, 

 each producing distally and externally a single simple straight branch, 

 slightly constricted at the three to four lower black septa ; the distal por- 

 tion without black septa, sometimes shorty sometimes elongate and tapering. 

 The inner appendage consists of a basal cell usually giving rise on either 

 side to a series of superposed cells similar to those of the outer append- 

 age, but mostly shorter and similarly branched ; the three series in general 

 partly united at least at the base, the basal cell in some cases bearing 

 more than two such series so that a very dense tuft of branchlets results. 

 Peritliecia IGo X 55-350 X 90 /li, average 275 X QO fi. Receptacle very 

 variable. Total length to tip of perithecium 425-1480 /x ; to insertion-cell 

 275-1260^. Appendages, longest 600 /:i, average about 400 /x. 



On Trichognnthus marginipennis Latr., Hope Collection, No. 267, 

 Columbia, Brit. Mus. No. 525, "Tamaz," S. America ; on " T. margi//atus 

 Latr." Brit. Mus. No. 526, Brazil, Hope Collection, No. 266, " S. 

 America"; on THchognathns sp. indet., Paris Museum, Nos. 70, 71, and 

 \'6b, Venezuela and " S. America." On all parts of host. 



Laboulbenia triordinata nov. sp. 



Perithecium usually wholly free from the receptacle, very variable, 

 amber-brown or usually becoming almost black, generally elongate, often 

 with the wall-cells showing a distinct spiral twist, the basal wall-cells 

 forming a hyaline or less deeply suffused neck ; the tip wholly black 

 except the lip-edges, which may be translucent and more or less distinctly 

 differentiated. Receptacle elongate or rather short, pale amber-brown or 

 amber-yellow, gradually tapering from the base to the very broad distal 

 portion, or more commonly cells I and H forming a slender stalk above 

 which the rest of the receptacle expands abruptly, the unmodified tri- 

 angular insertion-cell carried up and out free from the receptacle through 

 the enlargement of cell V, the inner margin of which is mostly free. 

 Outer appendage consisting of a series of about seven to ten obliquely 

 superposed cells, each bearing distally and externally a single simple 

 branch ; the branches constricted at the first, second, and third septa, 

 which are deeply blackened ; the second less broadly, the first and second 

 cells variably suffused with clear brown especially near the septa, the 

 distal portion of the branch hyaline, tapering, its cells longer, the lower 

 swollen below the septum : inner appendage consisting of a basal cell 

 which gives rise on either side to a branch resembling the outer append- 

 age often with fewer cells (sometimes only 3-celled) similarly branched, 



