41 S THAXTER. — MONOGRAPH OF THE LABOULBENIACE^. 
or benl toward the pore contrasting with the nearly colorless lip-edges below it. Receptacle pale brown 
,„• dirty olivaceous, elongate, normal. The insertion-cell nearly horizontal external to cell V, unmodified. 
The outer basal cell of the appendages giving rise to a single subcorneal brown prominence bearing branches 
terminally and externally and protruding beyond the inner basal cell, which is indistinguishable from the 
very numerous branches arising from it in all directions; all the branches hyaline, their basal cells bearing 
distally several brancWets which may again be branched, the four to eight lower septa dark. Peritheeia, 
average 175 X 44 /«; the spine-like apex 10-12 ft. Total length to tip of perithecium 400-575 ft; to 
insertion-cell 275-400 ft; greatest width 55-70 ft. Appendages about 70 ft. 
( )n Dineuietl, Brit. Mus. No. 482, Adelaide River, Australia. 
A comparison of this Australian form with more abundant material of L. Dineutls, makes it appear 
very doubtful whether the two should be kept distinct, and their separation must be considered merely 
provisional. I have included under this name the form on Macrogyrus elon gains , represented in fig. 
12 13, from New Guinea (Sharp Collection No. 1089) in which the conformation at the tip of the peri- 
tlieeium is even more unlike that of the typical L. Dineutis (fig. 18), and the appendages are very copiously 
developed. Yet it is hardly possible without examining more abundant material of all these forms to 
determine their relationships satisfactorily. 
Laboulbema fallax Thaxter. Plate, LXVII, figs. 14-15. 
Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 176. Dec, 1899. 
Perithecium becoming dark dirty olive-brown; the tip blackened, bent outward, the lips hyaline. 
Receptacle becoming coneolovous with the perithecium except the hyaline slender basal cell, the remain- 
ing cells usually short and stout except cell V, which extends up along the inner margin of the perithecium 
nearly to its tip, its inner margin continuing the curvature of the tip down to the insertion of the append- 
ages, so that the perithecium seems at first sight twice its actual size. Insertion-cell unmodified, forming 
a slight rounded external prominence within which the basal cells of the appendages form an evenly 
curved 1 ;e from which arises a single antero-posterior row of branches about twelve in number, their 
lower cells slightly inflated, hyaline with dark septa, usually twice branched; the ultimate branchlets 
above the third or fourth septum slender without dark septa, scarcely exceeding the tip of the perithecium. 
IVrithecium 100-120 X 35-40 //. Total length to tip of perithecium 190-325 fi; to insertion-cell 120- 
250 rt. Greatest width 85 //. Appendages 50 fi. (The larger measurements are from the Amazon speci- 
mens.) 
On Gyretes anitanguhis Sharp, Brit. Mus. No. 771 (Biologia Coll.), Bugaba, Panama; on Gyretes 
sp., Brit. Mus. No. 477, Amazon River; on Gyretes sp., Hope Coll. No. 229, llio de Janeiro. At tips of 
elytra. 
This species is very clearly distinguished, both from the monstrous development of cell V, and from 
the crest-like insertion of its appendages. The material is very scanty from all of the localities above 
mentioned, but there seems to be no considerable variation except in size and depth of suffusion, the 
latter, which involves the perithecium and the distal portion of the receptacle in most instances, is not 
1 
shown in fig. 14. In several specimens there are two, or even three, external blackish elevations below 
the tip of the perithecium, which look like the base of old trichogynes, and in one young specimen two 
triehogynes seem actually to have been formed one above the other. 
Laboulbema rotundata Thaxter. Plate LXVII, fig. 16. 
Proc. Am. Acad. Arts and Sci., Vol. XLI, p. 317. July, 1905. 
Perithecium deep brown, except below the tip; broadly rounded, the inner margin of the upper 
half free above the insertion-cells, and formed by a single long cell extending to the tip, somewhat as in 
f 
The tip 
. . - O © — — v»vv»u*vil Wi 1,1 IV, IttCUiatlCj CIO 111 LUC* I* »J£f^^»~~- 
Munt, with two minute inner tooth-like prominences of unequal size, the larger subtended by a narrow 
blaek suffusion, the whole tip more deeply suffused externally. Receptacle straight, elongate, tapering 
