NEW DIMORPHOMYCETEAE. 263 



ment of appendages. Receptacle faintly yellowish, becoming tinged 

 with brown, the posterior margin narrowly edged with deep black- 

 brown, tending to become short and stout with the upper part of the 

 anterior margin horizontal, or nearly so; consisting of eight to thirteen 

 cells, very greatly flattened, ^-er\• obliquely superposed, or the trans- 

 verse axis of the upper almost vertical. Primary appendage similar 

 to that of the male: secondary appendages two or three to six or 

 seven, stouter; a basal portion consisting of from one to rarely six 

 stouter, paler cells marked by scattered brown spots, and a more 

 slender, darker terminal portion one or more of the lower cells of which 

 are abruptly darker, the basal sometimes almost opaque, with straight 

 or slightly concave margins; those just above it often distinguished 

 by dark septa and slight constrictions, the whole terminal portion 

 resembling the primary appendage in a general way. Perithecia 

 variably elongated, one to several, the stalk-portion sometimes much 

 longer than the ascigerous part and rather clearh- distinguished from 

 it, but not always : at first pale, except the contrasting clear reddish 

 brown tip which subtends the short, rather flat hyaline apex. Peri- 

 thecia 100-360 X 20-30 m- Receptacle 80-110 X 25^5 fx. Primary 

 appendage 125-200 n, secondary loO-ooO /u. 



On the elytra and inferior thorax of Sphacrostylus Wyliei Murr. No. 

 3089, Kamerun, W. Africa. 



This striking species is most nearl\- related to D. Africanus and D. 

 Gonocnemalis, from which it is most easily distinguished by the form 

 of its receptacle and the peculiar maculation of the basal cells of its 

 secondary appendages. In the individuals of a group growing at the 

 base of the mid-legs the perithecia and appendages are very greatly 

 developed, the maculate basal cells especially, being larger and more 

 numerous. The individuals occurring elsewhere are almost uni- 

 formly much smaller, with rarely more than one maculate basal cell, 

 and the differentiation between the basal and terminal portions usually 

 far more pronounced. 



Dimeromyces decipiens nov. sp. 



Male individual (seen edgewise) rather slender; receptacle of two 

 cells, deeply tinged with reddish brown, except the anterior margin 

 and the base of the much larger basal cell. Appendage three-celled, 

 the basal evenly brown, contrasting abruptly with the other two 

 which are hyaline, taper slightly to the blunt tip, and are separated 



