NEW DIMORPHOMYCETEAE. 257 



prove specifically distinct. The projection, or appendage, from the 

 tip of its perithecium is much longer and more slender, and the 

 perithecium itself is long and slender. The difference is probably due, 

 liowever, to its position of growth. 



Dimeromyces Necrotalis nov. sp. 



Male individual (single specimen) pale yellowish. Receptacle 

 consisting of four obliquely superposed cells, the three upper pro- 

 ducing antheridia; the basal short, its pointed distal anterior angle 

 protruding below the base of the lowest antheridium. The appendage 

 straight, tapering, distally attenuated; the basal cell large and dis- 

 tally symmetrically rounded. Antheridia with a well defined short 

 stout stalk, the efferent tube region and neck both clearly defined, 

 about as long as the stalk and venter; the neck straight, rather stout. 



Female individual (single specimen) pale \'ellowish throughout; 

 consisting of ten cells, the basal narrow and extending horizontally to, 

 or slightly beyond, the base of the first secondary appendage; the 

 rest of the receptacle forming a horizontal series, all the cells except 

 the eighth and ninth, wedge shaped, the points downward ; the termi- 

 nal cell larger, subtriangular, externally abruptly prominent below 

 the base of the primary appendage; which is similar but slightly 

 stouter and somewhat shorter than the secondary appendages, 

 which tend to alternate with perithecia, diverging slightly from one 

 another, straight, tapering throughout, distally usually attenuated, 

 about seven or eight celled; forming, with the perithecia and recep- 

 tacle, a fan-like structure. Perithecia straight or the stalk curved; 

 the latter well developed, nearly uniform, about as long as the asciger- 

 ous portion, which is abruptly distinguished, symmetrically fusiform; 

 the distal half with two or three slight marginal depressions and ele- 

 vations, the upper distinguishing the tip rather clearly; the apex 

 well defined, about as long as broad, distally rounded. Perithecia 

 106 X (stalk) 8 X (ascigerous portion) lo/x. Longer appendages 

 75 X 7.5 /i at base. Horizontal cells of receptacle 35 X 10 m- 



On antennae of Xecrofa Africana Gr., Kamerim, West Africa. Xo. 

 2577. 



This species is represented by two mature and perfect individuals 

 and an additional female, in which the perithecia are still young. Its 

 chief interest lies in the fact that it illustrates very clearly the ease 

 with which the Dimero)nyrrs-type may run into the Dimorphomyces- 



