382 



THAXTER. MONOGRAPH OF THE LABOULBENIACE^D. 



On Serrimargo guttiger Schaum., Brit. Mus. No. 559, Penang, East Indies; on Serrimargo sp., Borneo, 

 in Cambridge University Collection (England), No. 121C>. 



This species is very clearly distinguished by the peculiar conformation of its black maculate recep- 

 tacle, and the attenuation, induration, and opaque suffusion of the basal cell of the latter; which is similar 

 to the condition seen in the type forms of L. Thyreopteri. The cell arrangement is somewhat similar to 

 that of L. Serrimarginis, which is its nearest ally, but which appears to be very different in other respects. 

 Although the cell arrangement is so abnormal, I am inclined to believe that the species is related to some 

 of the forms like L. finilima and L. subconstricia which occur on similar hosts. 



Laboulbenia Serrimarginis Thaxter. Plate LIX, figs. 23. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 201. Dec, 1899. 



Perithecium about three fourths free, dull olive-brown, the outer margin nearly straight, the inner 

 bent rather abruptly below the tip; the latter not abruptly distinguished, broad, blunt, the lips not well 

 defined, dull blackish. Receptacle dull olive-brown, except the almost hyaline rather slender basal 

 cell; the rest of the receptacle short and stout, concolorous with the perithecium, cell VI broad and 

 extending down to cell I beside cell II, cell VII extending half way down cell VI externally, the septa 

 of cells III and IV oblique; cell III extending up to the base of cell V. Outer appendage simple translu- 

 cent brown, paler distally, the basal cell twice as long as broad, bulging slightly externally; inner append- 

 age consisting of a much smaller basal cell which bears a branch on either side; the basal cells of each 

 branchlet bearing two simple branchlets similar to the outer appendage, erect, brownish, approximated. 

 Perithecia 13G X 50 /(. Total length to tip of perithecium about 300 /i; to insertion-cell 190 [i; greatest 

 width 85 [i. Appendages 260 /t. 



On Serrimargo guttiger Schaum., Brit. Mus. No. 558, Penang, East Indies. At base of anterior legs. 



A form most nearly allied to L. maculata, the cells of the receptacle being somewhat similarly arranged 

 and the appendages similar in general, but hardly to be confused with this species. Two mature specimens 

 only have been examined. 



Laboulbenia Pericalli Thaxter. Plate LV, fig. 12. 

 Proc. Am. Acad. Arts and Sci., Vol XXXV, p. 194. Dec, 1899. 



Perithecium becoming almost opaque, its upper fourth, sometimes only the tip, free from the recep- 

 tacle, relatively small, the tip more or less prominent, sometimes subcorneal, short, and wholly black 

 (often more prominent, abruptly distinguished, the rounded lips well defined with hyaline edges). Re- 

 ceptacle normal, cells III and IV large and broad, concolorous with the perithecium; cells I and II 

 together with the lower end of cell VI pale yellowish. Outer appendage mostly simple, stout, the lower 

 cells slightly inflated; inner appendage consisting of a much smaller basal cell, bearing a usually simple 

 branch on cither side very similar to the outer appendage; all the branches yellowish or becoming tinged 

 with brown, especially toward the base. Perithecia 110-130 X 37-45 p.. Total length to tip of perithe- 

 cium 200-300 /«; greatest breadth about 75 fi. 



On Pericallus guttatus Chev., Paris Museum, No. 78, Java; on Miscelus sp., Paris Museum, Nos. 

 113, 114, 115, New Guinea. 



The type form of this species (Paris No. 78), which is represented in fig. 12, is sufficiently character- 

 istic, its general habit recalling that of L. Maylayensis, the perithecium being almost wholly united to the 

 receptacle. I have seen specimens, however, that vary toward L. Catascopi, and it may be necessary 

 to unite the two eventually. 



Laboulbenia Catascopi Thaxter. 

 The typical form of this species as it occurs in Mexico, is sufficiently well distinguished, and easily 

 recognizable by its uniform amber-brown color, the inflated basal cell of the outer appendage, and the 

 rather abruptly distinguished tip of its perithecium. A comparison, however, of material on Cataseopus 



