714 THAXTER. 



35 m; longest branches 55X5-6^; antheridia about 12X4.5^i. 

 Total length to tip of perithecium 90-110 m. 



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

 No. 2513, Bocas del Toro, Panama. 



This species was obtained from a host for which I am indebted to 

 the kindness of Mrs. J. B. Rorer. It is closely allied to I. lingulatus, 

 but differs in its much greater size, straight habit and the conformation 

 of its perithecium, as well as in minor points. A comparison of the 

 fifteen adult specimens which have been examined with the abundant 

 material available of I. lingulatus, shows that the two do not tend to 

 vary toward intermediate forms. 



Ilytheomyces calycinus nov. sp. 



General axis irregularly curved inward, somewhat zigzag below the 

 venter. Subbasal cell relatively large, curved, or strongly bulging out- 

 ward. Appendage variably divergent, its axis blackened, the basal 

 and subbasal cells hyaline along the inner margin, distinguished by 

 a slight indentation; the small subhyaline androphorous cell bearing 

 a pair of rather strongly divergent, wholly brown, relatively slender, 

 evenly tapering, distally outcurved antheridia: the axis above com- 

 prising two or three indistinguishable cells, the branchlets relatively 

 short and scanty; the two lower blackened externally below, paler 

 distally above; the upper branches short, simple, not well developed, 

 somewhat brownish. Stalk-cell of the perithecium narrow, slightly 

 longer than broad, smoky brown below ; the cells above hyaline, rela- 

 tively small and subequal, with convex margins; the perithecium 

 dark blackish brown, the lower wall-cells slightly prominent, the inner 

 margin nearly straight, the outer convex; the apex rather abruptly 

 distinguished, slightly spreading, its four lip-cells dark brown with 

 hyaline terminations, the brown portions externally convex, the con- 

 vexities separated from one another by paler furrows, the whole sug- 

 gesting the slightly spreading lobes of a calyx; the right lateral lip 

 forming distally a hyaline flat-topped projection, which bulges outward 

 and inward, the outer lobe broader, the whole almost as broad as the 

 entire distal margin of the apex which it surmounts; the left lip-cell 

 also forming distally a narrow, slightly tapering, bluntly tipped pro- 

 longation directed obliquely inward, and projecting but slightly 

 beyond the inner lobe of the right lip-cell. Spores 25 X 2.5 yu. Peri- 

 thecia 60-68 X 17-20 m; the apex 15-17 X 15-17 n; stalk- and basal 



