716 THAXTER. 



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

 apex of its peritheeium, and by the pecuHar outgrowth from its second- 

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

 in I. manuhriolatus , 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 brow^n 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 peritheeium 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 peritheeium 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 /x. 

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

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

 Axis of appendage 50 yu; antheridia 16 m- Total length to tip of 

 peritheeium 100-140 ju. 



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

 Jamaica, W. I. 



This species departs rather strikingly from the normal type of the 



