Til A XT Kit. — MONOGRAPH OK TIF K LA HOULBENIACEiE. 



343 



Laikhjlhenia I'seudomasci Thaxter. Plate LIV, fig. 0. 



Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 190. Dec, 1890. 



Perithelia dark rich brown, slightly and rather evenly inflated, relatively large divergent, free from 

 the receptacle except at the very base; the broad opaque tip hardly differentiated, the lip-edges nearly 

 hyaline, not prominent, turned slightly outward. Receptacle colorless or yellowish below, distally brown- 

 ish, slender, its axis coincident with that of the appendages; cell I usually larger and longer than cell II, 

 the rest of the receptacle relatively unusually small, the inner margin of cell V partly free from the perithe- 

 eium. Insertion-cell free, black. Outer appendage consisting of a basal cell several times longer than 

 it is broad, which may branch above its basal or subbasal cell one to three times successively, the branch- 

 lets divergent; the inner appendage consisting of a much shorter basal cell bearing one or rarely two 

 branches, sometimes simple, mostly one to three times branched, all the branches becoming more or less 

 suffused with brown. Spores about 65 X 45 p.. Perithecia 120-1C>5 X 60 fi. Total length to tip of 

 perithecium 225-300 it; to insertion-cell 170-240 p.. Appendages, longest 100 /i. 



On Pscvdumascus nigrita, Fab., Paris Museum, No. 201, Mongolia. Near upper inferior margin 

 of prothorax on left side. 



This species recalls L. umbonata in its habit of growth, the axis of the receptacle being coincident 

 with that of the appendages, the perithecium being laterally inserted at an angle of 45° or more, the outer 

 appendage often unbranched, except distally, and the basal cell of the inner appendage giving rise, as a 

 rule, to one branch only. The abrupt enlargement of cell I, immediately below cell II, and the form and 

 contrasting coloration of the perithecium, are also characteristic. 



Laboulbenia Oopteri Thaxter. Plate LIV, fig. 12. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 190. Dec, 1899. 



Perithecium three fourths or more free, translucent blackish brown, the inner margin evenly curved 

 outward, the outer margin with slight elevations at the septa and curved abruptly inward to form the 

 well differentiated tip which is pale brownish, with dark inferior suffusions. Receptacle concolorous 

 with the perithecium, except that cells I and II are usually hyaline, the suffused portions sparsely, rather 

 coarsely and distinctly punctate. Insertion-cell broad and black. Basal cell of the outer appendage 

 for the most part very long, simple or usually bearing distally an outer and an inner branch sometimes 

 three, the former with blackened basal septum, simple, or once branched, in which case the basal septum 

 of the outer branchlet is also blackened. Inner appendage consisting of a very small basal cell bearing 

 a short branch on either side. Perithecia 95-110 X 30-35 p.. Total length to tip of perithecium 175- 

 275 p; to insertion-cell 85-160 p. Appendage broken, 200 p, probably much longer. 



On elytra of Oopterus rotundic.ollis White, Brit. Mus. No. 613; Sharp Coll. No. 1161, on Cyclothorax 

 insularis, New Zealand. 



This species is distinguished by the enlargement and elongation of the basal cell of the outer append- 

 age which may be much broadened distally, so as to become triangular in outline; and though it more 

 commonly bears two terminal branches, as in fig. 12, and is sometimes not even once proliferous, it may 

 become twice proliferous, so that three closely set branches arise from it in radial succession, each of 

 which may branch above its basal cell. The outer branch is always distinguished by a black septum, 

 and its outer branchlet is similarly distinguished and more or less distinctly edged externally with black. 

 The figure was drawn from the material on Oopterus. I shall endeavor in a future publication to illustrate 

 this species more fully from the CyelotJiorax material which is in good condition and sufficiently abundant. 

 The species appears to be allied to L. bidentata and L. Coptcce, but is readily separated from either. 



Laboulbenia Copte.e Thaxter. Plate LIV, fig. 13. 

 Proc Am. Acad. Arts and Sci., Vol. XXXV, p. 1G7. Dec, 1899. 



Form slender. Perithecium free, except the base, nearly straight, curved outward slightly at the tip, 

 which is blackish with hyaline lip-edges; dull translucent olive-brown, concolorous with the receptacle, 



