THAXTER. — NEW LABOULBENIACEAE. 23 



Receptacle 25 p. Free appendage to tip of spinous process 36 X 12 11. 

 Total length to tip of perithecium 125-150 p. 



On elytra of Atomaria ephippiata Zimm., Kittery Point, Maine, and 

 Intervale, N. H. 



Acompsomyces pauperculus nov. sp. 



Hyaline or nearly so. Receptacle short, somewhat bent ; the distal 

 cell very small, irregular, sharply pointed below, externally separated 

 from the basal cell by an oblique septum ; the basal cell three or four 

 times as large, narrow below, expanded above its distal point, forming a 

 ri^ht angle, the septum on one side applied to the base of the stalk-cell 

 of the appendage. The latter subtriangular, its lower half in contact on 

 the inner side with the two cells of the receptacle, its upper with the 

 stalk-cell of the perithecium ; the rest of the appendage free, relatively 

 large, hardly inflated, its lower cell about as large as the two upper 

 combined and bearing commonly one, sometimes three, antheridia as in 

 A. Atomariae ; the two cells above it nearly equal or the upper often 

 smaller and bearing its antheridium subterminally, so that the spinous 

 process of the latter appears to terminate the appendage, the wall dis- 

 tinguishing this antheridium being commonly invisible from its obliquity. 

 Stalk-cell of the perithecium about as large as that of the appendage and 

 similarly shaped, except that its position is reversed, separated distally 

 from the basal cells of the perithecium by a very oblique septum : the 

 body of the perithecium short, stout, bent asymmetrically, and consider- 

 ably inflated ; the inner margin straighter, the short squarish tip rather 

 abruptly distinguished, the apex subtended by four distinct symmetrical 

 prominences, which form a crown surrounding the four appressed pro- 

 longations of the lip-cells, which appear as a blunt, conical protuberance 

 within it: all the cells rather thin-walled. Spores 45 X 4 p. Perithecia 

 70 X 30-35 ^ the stalk-cell 12-18x9. Receptacle 20-30 ti. Free 

 appendage 32-36 /x. Total length to tip of perithecium 110/*. 



On elytra, prothorax, and legs of Atomaria sp., Kittery Point, Maine, 

 June. 



ACALLOMYCES nov. gen. 



Receptacle consisting of two superposed cells, the lower sometimes 

 apparently obliterated or indistinguishable from the foot, the upper 

 bearing a single perithecium and an antheridial appendage. Appendage 

 consisting of six superposed cells, the hasal cell closely associated with 

 the receptacle and the stalk-cell of the perithecium ; the terminal-cell 



