392 



THAXTER. MONOGRAPH OF THE LABOULBENIA' ~EM. 



nearly hyaline, or yellowish; while cells III and IV are separated by a horizontal septum, not obliquely 

 superposed, as in the last mentioned form. The primary appendages are not divergent, as in L. pcrplc.ro, 

 their branches much shorter, the basal cells of the primary appendages combining with the insertion cell 

 to form a much broader black, and externally more prominent, general insertion. The perithecium of 

 the present species is, in all the examples, marked by fine longitudinal wrinkles which may be due to a 

 lack of complete turgescence in the mounted material. 



Laboulbenia triordinata Thaxter. Plate LXIII, fig. 15. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 207. Dec, 1S99. 



Perithecium usually wholly free from the receptacle, very variable, amber-brown or usually becoming 

 almost black, paler subdistally, generally somewhat elongate, the wall-cells usually 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 brown and are more or less distinctly differentiated. Re- 

 ceptacle variable, minutely punctate, pale amber-brown or amber-yellow, gradually tapering from the 

 base to the often relatively broad distal portion, or more commonly cells I and II forming a slender stalk 

 above which the rest of the receptacle expands abruptly, the unmodified colorless triangular 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 conspicuously, the basal and subbasal cells 

 variably suffused with clear brown especially near the septa, the distal portion of the branch hyaline, 

 tapering, somewhat inflated above its usually brown base: inner appendage consisting of a basal cell 

 which gives rise on either side to a branch resembling the outer appendage, often with fewer cells (some- 

 times only 3-celled) similarly branched, except that the lower branch consists of a single cell which bears 

 terminally a solitary antheridium that becomes brown; the outer appendage and the two branches of the 

 inner erect and close together, or more or less strongly and irregularly divergent. Perithecia, average 

 200 X 52 /< (110-260 X 45-00 a) including stalk. Total length to tip of perithecium 260-600 /r, to 

 insertion-cell 185-370 /x; greatest width 65-100 \i. Appendages 220-330 p.. 



On Calophwua bifasciala Oliv., Brit. Mus. No. 509, South America; on Cafophana sp., Brit. Mus. 

 No. 512, Nanta, Amazon; on C. bicinctus Dej., Hope Collection, No. 268, Brit. Mus. 508, Columbia; on 

 Calophcena sp., U. S. National Museum, Central America; Berlin Mus. No. 953, on Calophama bicinctus 

 Dej., Bogota. 



The typical form of this species shows variations of no great importance, which are, for the most 

 part, dependent on the variable development of its receptacle, of which fig. 15 shows an average form. 

 Many, however, are more elongate, while very often a peculiar habit results from the fact that the two 

 basal cells become abruptly distinguished from the distal portion, as a slender stalk. Individuals also 

 occur in which the general form is quite normal, like other members of the L. flagcllata type. A single 

 small group of individuals obtained from the inferior surface of the prothorax of Cahphacna bifasciata 

 (Brit. Mus. No. 509), though otherwise similar to the type, possess a narrow black insertion cell: while on 

 the legs of Cordistes (Calophana) bicinctus Dej. (Hope Coll. No. 268) as well as from a Central American 

 Calophcena in the U. S. Nat. Mus., No. 19, a well marked variety has been found, strikingly unlike the type 

 from the fact that its more compact receptacle is, with the exception of its basal cell, deeply suffused with 

 blackish brown, the suffusion involving the insertion-cell as well as the basal cells of the appendages. 



The tip of the perithecium, in specimens in which the twist in the wall-cells is sufficient to give a 

 posterior view, show a symmetrically bluntly bilobed outline, somewhat similar to that of L. aristata 

 (Plate LX, figs. 27- 29). The species is allied to L. Helluomorphce, which is most easily distinguished 

 by the black septum which subtends its antheridium, and also approaches L. perplexa in the tendency 

 to diverge shown by the primary axes of its appendages; a character which is, however, not always 

 pronounced. 



