410 PROCEEDINGS OP THE AMERICAN ACADEMY. 



corresponding portion of the Bterile portion of the reo ptacle. Sp< 

 about 20 ••'!/'. Peritbecia in well developed individuals LOO ■ 18 ft. 

 Lateral portion of receptacle 75 • 20 /*, the sterile portion 60/*. Ap- 

 pendages about 58 < 13 //. 



On Myrmedonia flavicornU Fauv., British Museum i Biologia Coll.), 

 \ , 766, G uatemala. 



Dimorphomyces Thleoporae nov. gp. 



MtiL- individual much as in D. muticus, the receptacle ending in a 

 shorl blackened cell, bluntly rounded or nearly truncate. Total length 

 tn tip of antheridium 66 «, to tip of sterile cell 37 \u 



Female individual. Structure of tlie receptacle like thai of the other 

 species, but only developed on one side of the median Bterile portion, 



which < sists of three cells like that of the male individual and is black 



tipped. The appendages and perithecia arising as in the other species, 

 the latter nearly symmetrically Fusiform, bluntly rounded at the tip, tit. 

 with Bmoky brown, the tip undifferentiated, the appendages (broken) 

 relatively large and simple. Perithecia (not quite mature) 50 < \ i /i. 

 Foot to end of lateral portion 50 tt. Total length to tip of perithecium 

 80/-. 



On Thleopora corticalis Gz., Paris Museum, No. 297, Santa Anna. 

 Madeira. On inferior surface of abdomen. 



Dimeromyces pinnatus now Bp. 



Male individual consisting of a basal cell more than twice as Long as 

 broad, the axis above of eight or nine cells separated by horizontal septa, 

 all hut the lowot and the terminal cell separating a small cell on one side 

 which forms the base of an antheridium or of a Bterile appendage, tin- 

 two organs diverging slightly from one another bo as to form two vertical 

 rows. Anlheridium compound, short and stout, the \ enter abruptly dis- 

 tinguished from the stout ne^k. the base of which is Blightly enlarged 

 and purplish brown, the distal part tapering very Blightly, the apex 

 blunt. Appendages consisting typically of six cells, including the basal 



Cell, constricted at the dark septa, the distal cells sull'iiscd with brownish, 



the terminal one larger, longer, and more or less vesicular, the thick 

 walls tending to gelatinous degeneration. Total length of receptacle 

 100 < 12 /*. Antheridia 35 < 12 /*. Appendages 50 X 7 /*. 



Female individual. Basal cell large and stout, the cells above it about 

 twenty in number, greatly Battened, the septa horizontal, a lew of the 



