258 THAXTER. 



type: since a Aery slight variation in the method by which the inter- 

 calary cells of the horizontal axis are cut off from the basal cell, would 

 make it conform entirely to the characters of the last mentioned 

 genus. In the present instance, however, the subbasal cell which 

 bears the primary appendage becomes displaced so as to end the 

 horizontal series on one side, the extension of the basal cell keeping 

 pace only Avith the last two or three cells separated from it at the 

 other extremity of the series, below which it forms a short margin. 



Dimeromyces unguipes nov. sp. 



Male individual rather evenly tinged with pale brown: slender, 

 erect, the foot long, slender and claw-like. Receptacle consisting of 

 three cells; the basal much longer, and but slightly broader distally; 

 the subbasal narrow and oblique, prominent below the base of the 

 erect antheridium ; which arises from the distal cell and reaches above 

 the apex of the 3-celled somewhat tapering erect terminal appendage. 

 Antheridium with a well developed free stalk somewhat shorter than 

 the parts above: the venter stout and rather short, more prominent 

 distally and externally, the antheridial cell tube region and the efferent 

 neck short, of about equal length, clearly distinguished and bent 

 slightly inward. Antheridium 38 X 9 )u. Receptacle, without foot, 

 34 X 8 /x. Appendage 27 fx. Total length to tip of antheridium 

 80-90 M- 



Feviale individual rather slender, erect; the foot long and claw -like; 

 the receptacle consisting of five obliquely superposed cells; the three 

 mid-cells much flattened and obliquely superposed, the basal much 

 longer, the third producing a secondary appendage, the fourth a 

 perithecium. Primary appendage of three successively smaller cells, 

 the distal darker; secondary appendage nearly twice as long, the basal 

 cell longer than the three terminal ones combined, the two mid cells 

 darker brown. Perithecium straight, erect, slender; its greatest 

 width just below the tip, whence it tapers gradually and evenly to the 

 narrow insertion; the stalk well developed, but not distinguished 

 clearly from the body, which is more deeply tinged with brown for 

 some distance below the tip, the lower half of this darker area marked 

 by fine transverse lines which correspond to slight ridges which extend 

 nearly to the insertion of the stalk: the tip and apex blunt conical, 

 subsymmetrical. Perithecium 135 X 16 /x. Secondary appendage 

 66 X 8.5 m; primary 34 X 6 m- Receptacle without foot, 42 X 16 m- 

 Total length to tip of perithecium ISO /x- 



