NEW DIMORPHOMYCETEAE. 279 



perithecium. The latter is solitary in all the specimens examined, 

 but the fourth cell of the receptacle separates a small cell which m ax- 

 perhaps sometimes develop a second perithecium or secondary 

 appendage. 



Dimeromyces annulatus nov. sp. 



Male individual very faintly tinged with brownish, the receptacle 

 of two cells, the subbasal subtriangular, bearing the undifferentiated 

 basal cell of the simple appendage distally, and laterally and obliquely 

 the solitary antheridium; which is rather stout, erect, the stalk-cell 

 oblique, the venter somewhat inflated, the neck rather short and stout, 

 distally strongly curved outward. The appendage erect, simple, 

 three-celled, the subbasal cell slightl\- narrower, squarish, distinguished 

 l)y dark septa. Length to tip of appendage 28 X 7.5 tx. The anther- 

 idium 17 X 5.5 fx. 



Female individual pale brownish, the receptacle spathulate or 

 subtriangular, consisting of four superposed cells, which become more 

 or less displaced by a prominent bulging of the third cell on the 

 posterior side, and by the enlargement of the basal cells of the three 

 appendages. Primary appendage four-celled, the subbasal short, 

 somewhat narrower, and distinguished by dark septa; the three 

 terminal cells of the receptacle flattened and broad; the third bearing 

 the perithecium and protruding posteriorly; the second producing 

 the first lateral appendage; the third the primary and a second lateral 

 appendage, both the latter distinguished below by the presence of 

 liroad short cells separated by dark annular septa, of which there may 

 be five to six in the second and somewhat fewer in the first; the termi- 

 nation of the appendages hyaline, slightly inflated, their total length 

 not half that of the perithecium, from the base of which they may 

 diverge slightly. Perithecium ^•ery slightly curved, somewhat 

 asymmetrical, its base broad without any differentiated stalk-region, 

 tapering slightly, distally, to a blunt slightly asymmetrical termina- 

 tion. Spores about 32 X 2.5 m- Perithecia, larger 56 X 10 jj.. Pri- 

 mary appendage 20 X 5 m; larger secondary 30 X 3.5 /x. Receptacle 

 13-15 X 13 /x. 



On the inferior abdomen of Chaciospania pacdciina Gerst. No. 

 2205, Kamerun, W. Africa. 



This minute species is most nearly related to D. apprcssus from 

 which it is readily separated by its annular appendages and sessile 

 perithecium. The compact and relatixely small receptacle appears 



