NEW LABOULBENIALES, 715 



cell region 18 X 12 /x. Subbasal cell of the receptacle 12 /i. Axis of 

 the appendage 25-35 /x, the longest branch 20 /x; the antheridia 14 ix. 

 Total length to tip of perithecium 90-110 /x. 



On the upper surface of the left wing near the base of Ilythea sp. 

 No. 1929 (Type) Battersea, and No. 2043d, Clarkstown, Jamaica, 

 W. I. 



This minute species is clearly distinguished by the peculiar develop- 

 ment of its apex; the suffused portion of which, when viewed side- 

 wise, has the appearance of a slightly opened four-lobed calyx. The 

 four lower wall-cells, forming the venter proper, are relatively short 

 and distally more distinctly prominent than in other related species. 

 It is most nearly allied to /. ohtusus, which also lacks anything in the 

 nature of a trigger-organ. 



Ilytheomyces obtusus nov. sp. 



General axis erect, with four slight successive curvatures. Subbasal 

 cell relatively small, hardly broader than long, its outer margin but 

 slightly convex. Axis of the appendage blackish, except along its 

 inner margin ; the basal cell somewhat longer and narrower than the 

 subbasal; the androphorous cell relatively small, hyaline, its base but 

 shghtly oblique; bearing a pair of relatively short, brown, slightly 

 out-curved and divergent antheridia; the third cell commonly pro- 

 ducing only the usual inferior branch, the other two both inferior and 

 superior branches, the upper bearing one or more slightly tapering 

 branchlets. Stalk-cell of the perithecium about as large as the sub- 

 basal cell below it, hardly longer than broad, slightly intruded above, 

 somewhat larger than the small subsimilar hyaline cells above it, the 

 secondary stalk-cell producing a tooth-like, straight, slightly curved, 

 or even recurved, blunt, somewhat tapering outgrowth, which aris- 

 ing externally, or usually on the left side, projects obliquely forward: 

 the perithecium wholly dark brown, straight, the axis bent outward, 

 the margins asymmetrically convex, the apex wholly brown with a 

 lateral vertically elongated lighter area, bent inward, clearly distin- 

 guished, broad, short, distally asymmetrically rounded; the lips 

 forming slight irregularities in the outline. Spores 30 X 2.5 ju. 

 Perithecia 48 X 18-20 /x. Axis of appendage 30 /x, longest branch 

 35 /x. Subbasal cell 6-7 /x. Total length to tip of perithecium 80 /x. 



Near base of left wing of Ilythea sp., No. 2043e, Clarkstown, Jamaica, 

 W.I. 



