700 THAXTER. 



Dimeromyces Kamerunensis nov. sp. 



Male individual. Very small, hyaline or becoming faintly tinged 

 with brown, the axis consisting of three successively smaller cells 

 somewhat longer than broad, the terminal appendage subtended by a 

 black septum, its basal cell faintly colored, with convex margins; the 

 subbasal similar in size; the rest of the appendage hyaline, slender, 

 somewhat tapering, with two indistinct septa. Antheridium single, 

 or rarely two, the venter somewhat bulging, tapering to the slightly 

 outcurved, blunt, pointed distal portion. To tip of antheridium 30 X 

 8 fjL, including relatively large black foot. Appendage 20-40 X 4 /i. 



Female individual. Axis of receptacle brown above, hyaline below; 

 consisting of from six to twelve, or sometimes more, superposed cells; 

 the basal several times as long as broad, but slightly narrower toward 

 the base; the remaining cells broader than long, the lower more 

 flattened, the terminal one small and rounded, bearing distally a 

 short tapering appendage similar to that of the male; usually six to 

 eight of the cells below it bearing single simple appendages or peri- 

 thecia : the appendages erect or but slightly diA'ergent, the cells above 

 the basal separated by slight indentations: consisting, usually, of 

 seven cells; the basal separated by a narrower purplish black region 

 from the subbasal, which is about as long; the third to fifth succes- 

 sively smaller; the fifth somewhat broader than long; the sixth 

 minute, distally rounded into the base of the terminal cell; which is 

 large, greatly inflated, distally abruptly narrowing to a broadly 

 rounded extremity, disorganized at maturity, the spreading or re\o- 

 lute remains of its wall persistent, and adhering around the minute 

 subterminal cell; the appendages becoming dark brown, diA'erging 

 in two more or less definite ranks, the extremities slightly incurved, 

 one or two of the uppermost much shorter. Perithecia uniformly 

 pale dirty brownish yellow, the apex hyaline; one or two in number, 

 relatively small, hardly longer than the appendages, or even shorter, 

 becoming gradually broader from the insertion upward ; the lower half 

 somewhat inflated, tapering thence to the broad termination, the 

 compressed inner lip-edges forming a short, slightly oblique, short- 

 conical projection, subtended by three well marked papillae. Peri- 

 thecia 88-105 X 14-21 ij.. Appendages, longest 105 X 12;u; primary 

 appendage about 25 X 3 m- 



On the head and legs of a pale yellow oscinid with slightly smoky 

 wings. Xo. 23G7, Kamerun, West Africa. 



This striking species is most nearly related to D. coarctatus, but 



