THAXTER. — 



MON()(iHAI'II OF THE LABOULBENIACEjE. 



Laboulbenia imitans Thaxter. Plato LIX, figs. 24-20. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 180. Dec, 1899. 



Perithecium free, long, rather slender, curved slightly outward, suffused with dark smoky brown, 

 tapering Father abruptly to a somewhat truncate sometimes neck-like tip, the inner lip-cells darker: the 

 basal cells forming a hyaline well developed neck. Receptacle short, stout, subtriangular, usually 

 abruptly bent above the basal cell, becoming deeply suffused with blackish brown, coarsely and conspic- 

 uously punctate, except where quite opaque, the opacity first involving the anterior and lower portions 

 above the hyaline basal cell: cells IV and V nearly equal, cell IV bulging outward, more than half its 

 upper surface being free from and external to the black insertion-cell. Outer appendage consisting of 

 a hyaline basal cell which may become entirely opaque, its upper and outer margins curving evenly in- 

 ward to form a deeply blackened ridge, from which arises a crest-like series of from three to five, or even 

 six, branches, which are rigid opaque or deeply suffused and several times branched, especially distally; 

 the inner appendage consisting of a much smaller basal cell which gives rise to a branch on cither side, 

 the branches laterally divergent, or erect, and similar to the main branches of the outer appendage; the 

 successive cells of all the branches and branchlets, except at the very tips, externally blackened and dis- 

 tinguished by contrasting and more or less prominent black septa. Spores 42 ft long. Perithecium 

 (exclusive of neck) 150-255 X 28-58 p; the neck 20-60 X 20-32 p. Total length to tip of perithecium 

 270-585 p; to insertion-cell 100-225 p; greatest width 50-80 p. Appendages, 45-200 p. 



On Nijdeis sp., Paris Museum, No. 29, Madagascar. Berlin Museum No. 934, on Thyreopterus 

 hrrn'roUis KL, and No. 935 on T. subkevis Casteln., both from Madagascar. On legs, elytra and abdomen. 



This species which has very much the appearance of species of CoretJiromyccs, is most nearly related 

 to L. forfieulata and L. fissa. In the material obtained in the Berlin Museum from T. hreoiro/li.s, the 

 individuals are far larger than the original types, almost twice as large, but there seems no doubt as to the 

 identity of the two, although the form of the perithecium and its tip is somewhat different in the Berlin 

 material. On T. sublcevis a single mature individual was found in which the total length reaches nearly 

 800 p; the perithecium 265 X 65 fi, its neck 150 p; the receptacle but slightly suffused, over 325 // long 

 and without maculation. The appendages are, however, the same and the form is undoubtedly referable 

 to the present species. 



Laboulbenia fissa Thaxter. Plate LIX, figs. 12-13. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 177. Dec, 1899. 



Perithecium three fourths or more free, short and stout, slightly bent toward the appendages, dirty 

 olive-brown becoming deeply suffused with blackish brown except distally just below the tip, which is 

 abruptly distinguished, long, narrow, hyaline below its black distal portion, furcate, the inner fork formed 

 by the upgrowth of one of the inner (right) lip-cells which grows outward and abruptly upward beside 

 the deep black blunt-tipped projection formed by the other three which it may equal in length, though 

 narrower and somewhat paler. Receptacle short, the basal cell largest, pale yellowish or hyaline, of about 

 the same diameter throughout, broader than cell II, which is short, narrow, of equal diameter throughout, 

 hyaline or yellowish at the very base, the rest opaque and indistinguishable from the remainder of the 

 receptacle, which expands abruptly above, and may become opaque, except the upper part of cell IV and 

 cell V. Insertion-cell much narrower than cells IV-V. Outer appendage consisting of several super- 

 posed cells, which form a black opaque axis, usually broken off, curved outward, each cell producing a 

 short hyaline or brown edged branchlet distally on the inner side; the inner appendage consists of a 

 smaller basal cell, which gives rise on either side to a branch much like the outer appendage, its main 

 axis less deeply blackened, curving outward on either side of the perithecium, the hyaline branchlets 

 arising from its convex side mostly once branched and sometimes reaching above the tip of the peri- 

 thecium. Perithecia, average 150 X 48 p, including the tip, which is about 45 X 18-20 p. Total 

 length to tip of perithecium 290-300 p; to insertion-cell 185 p; greatest width 70 ,«. Appendages about 

 110 p. 



