NEW DIMORPHOMYCETEAE. 265 



long slender neck of the single antheridium and the rather peculiar 

 appendage are its chief peculiarities. 



Dimeromyces ametrothecalis nov. sp. 



Mdic individual very pale yellowish, almost hyaline. Receptacle 

 three-celled; including the foot, roughly an inequilateral triangle, 

 bearing a two-celled subulate ?hort appendage from its upper angle, and 

 normally two antheridia from its upper side arising from the nearly 

 equal subbasal and terminal, smaller, triangular cells. Antheridia 

 nearly straight and symmetrical, the upper inclined against the ap- 

 pendage, the lower often slightly divergent ; the stalk-cell short and well 

 distinguished; the venter stout, nearly symmetrical; the neck rather 

 long, straight and well differentiated, extending far abo\e the tip of the 

 appendage. Receptacle without foot 21-22 X 9-10 m. Appendage 

 13-17 M- Antheridia 30-38 X 10 /x. Total length to tips of necks 

 63-66 M- 



Female individual pale yellowish, becoming tinged with brown. 

 Receptacle relatively minute, consisting of four cells, the basal much 

 larger, the rest successively smaller, somewhat flattened and oblique. 

 Primary appendage short, three-celled, subulate; the secondar\- single, 

 arising from the subbasal cell, nine or ten -celled, tapering, lying 

 obliquely against the base of the perithecium, the cells mostly broader 

 than long, separated by somewhat oblique septa, and decreasing 

 slightly in size from below upward. Perithecia normally single, 

 arising from the third cell, monstrously developed, becoming more or 

 less deeply tinged with reddish brown; the stalk well developed, 

 curved, but not clearly distinguished from the ascigerous portion, 

 which becomes gradually broader; the tip rather clearly defined, more 

 convex on one side, paler; the apex short, slightly bent, rounded, 

 clearly distinguished. Perithecia 170-400X25-27/1. Receptacle 

 and foot 38-42 X 12-15 )U. Primary appendage 16-20 /x; secondary 

 40-60 M- Total length to tip of perithecium 200-430 fx. 



On the upper surface of the abdomen of a flat Cucujid, belonging 

 to an undescribed genus. No. 2339, Kamerun, West Africa. 



This form does not appear to be nearh- related to any other and is 

 very clearly distinguished by its monstrous perithecia, small subulate 

 primary, and straight closely and obliquely septate secondary append- 



ages. 



