716 THAXTER. 



This species is well distinguished by the brown, rounded, unmodified 

 apex of its perithecium, and by the peculiar outgrowth from its second- 

 ary stalk-cell, which resembles that which occurs in the same position 

 in /. vianubriolatus, to which it is probably most nearly related; 

 although its apex is very differently shaped, and lacks the well devel- 

 oped trigger-organ of the latter species. It appears to be rare, only 

 a dozen individuals having been examined, from a single host. 



Ilytheomyces anomalus nov. sp. 



Straight, erect. Basal cell of the receptacle distally hyaline and 

 clearly visible, subbasal cell long-triangular, pointed below, hyaline. 

 Axis of the appendage stout, opaque below, dark brown and but 

 slightly bent distally, the basal and subbasal cells large, opaque, 

 distinguished by slight indentations on both sides, the androphorous 

 cell minute, squarish, pale brownish, bearing terminally a single 

 larger straight stout antheridium, the venter mostly hyaline, the neck 

 purplish, except the hyaline tip; the remainder of the axis consisting 

 of about five obliquely separated cells, the two lower much larger; 

 the second bearing externally a blunt, spur-like projection resembling 

 an abortive antheridium; the rest producing, from the upper side 

 only, short, single, stout, more or less abortive simple branches. 

 Stalk-cell of the perithecium hyaline, very large, distally prominent 

 below the almost opaque small inner basal cell, and separated ob- 

 liquely from the secondary stalk-cell, which is also obliquely separated 

 from the small, strongly protruding, more or less suffused outer basal 

 cell: the perithecium becoming blackish brown, the upper limits of 

 the lower wall-cells indicated by variably conspicuous indentations, 

 stout and nearly symmetrical below the somewhat tapering tip- 

 and apex-region; which may become rather clearly distinguished, 

 and is more or less distinctly curved outward to the rather broad 

 rounded or somewhat flattened termination; the subhyaline lip-edges 

 indistinguishable, or but slightly prominent. Spores 28 X 2.8 m- 

 Perithecia 50 X 16-62 X 24 m: stalk-cell 20-50/x; the stalk- and 

 basal cell region 32-60 X 13-17 ^i. Receptacle including foot 28 ju. 

 Axis of appendage 50 ju; antheridia 16 /x. Total length to tip of 

 perithecium 100-140 jjl. 



On the posterior right leg of Ilythca sp. No. 2043b, Clarkstown, 

 Jamaica, W. I. 



This species departs rather strikingly from the normal type of the 



