712 THAXTER. 



stout yellowish brown branchlets. Stalk-cell elongate, stout, nearly 

 uniform; basal cell region abruptly distinguished, rich amber-brown, 

 concolorous with the perithecium, its cells thick-walled, somewhat 

 prominent, and surrounding the base of the ascigerous cavity; the 

 two lower tiers of wall-cells distinguished by a slight indentation, the 

 corresponding regions slightly inflated and marked by fine transverse 

 lines; the second tier narrower below the well distinguished tip which 

 is more or less symmetrically inflated, forming a rounded collar sub- 

 tending the clearly distinguished paler apex; which is somewhat 

 longer, very slightly bent outward, bearing a short, stout, bluntly 

 pointed, two-celled, tooth-like outgrowth from the lower half of its 

 inner margin. The whole perithecium, including the basal cell region, 

 slightly curved outward. Perithecia, including basal cell region, 

 135-140 X 35-40 fx. Stalk-cell 2S0-350 X 22 fx. Appendage 185- 

 195 /x; the branch-axis 18 /x, the branchlets 18 /x. Receptacle 28 X 

 20 n. Total length to tip of perithecium 400-525 ijl. 



On the inferior tip of the abdomen of Diopsis sp. Xo. 2301, Kamerun, 

 W. Africa. 



Allied to R. circinaUs and R. gibbosus, but differing from both in 

 the characters of iis perithecium and appendage. 



Rhizomyces gracilis nov. sp. 



Erect, very long and slender; foot normal. Basal cell of the recep- 

 tacle broader than long, somewhat smaller and broader than the 

 subbasal, obliquely prominent below the base of the appendage; sub- 

 basal cell longer than broad, its axis divergent, distinguished externally 

 by a slight constriction above and below. Appendage consisting of 

 about seventeen hyaline cells, erect, slightly exceeding the tip of the 

 perithecium, its basal cell small and subtriangular, obliquely adjusted 

 to the receptacle, the two cells above it hardly larger, the rest for the 

 most part large, slightly more than twice as long as broad, except one 

 or two of the distal ones; the branches of the appendage similar to 

 those of R. covfvsus, consisting of five or six dark hj-aline-tipped, 

 outcurved, closely set branchlets, which arise in a vertical series from 

 a short dark unicellular inwardly hyaline axis, in most cases subtended 

 by a small hyaline cell bearing two or three slender antheridia; the 

 small terminal cell of the axis bearing distallv two or three similar 

 erect branchlets. Stalk-cell of the perithecium stout, hyaline, erect, 

 gradually broader distallv; the secondary stalk-cell and the basal 



