410 PROCEEDINGS OF THE AMERICAN ACADEMY. 



corresponding portion of the sterile portion of the receptacle. Spores 

 about 20 X 3 [X. Perithecia in well developed individuals 100 X 18 ^. 

 Lateral portion of receptacle 75 X 20 jj., the sterile portion 60 /j.. Ap- 

 pendages about 58 X 13 yu.. 



On Mijnnedonia jiavicornis Fauv., British Museum (Biologia Coll.), 

 No. 766, Guatemala. 



Dimorphomyces Thleoporae nov. sp. 



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

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

 to tip of autheridium 66 ,u, to tip of sterile cell 37 ^. 



Female individual. Structure of the receptacle like that of the other 

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

 which consists 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, tinged 

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

 relatively large and simple. Perithecia (not quite mature) 50 X 14 /a. 

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

 80 II. 



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

 Madeira. Ou inferior surface of abdomen. 



Dimeromyces pinnatus nov. sp. 



Male individual consisting of a basal cell more than twice as Ions: as 

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

 all but the lowest and the terminal cell separating a small cell on one side 

 which forms the base of an antheridium or of a sterile appendage, the 

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

 rows. Antheridium compound, short and stout, the venter abruj^tly dis- 

 tinguished from the stout neck, the base of which is slightly enlarged 

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

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

 cell, constricted at the dark septa, the distal cells suffused with brownish, 

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

 walls tending to gelatinous degeneration. Total length of receptacle 

 100 X 12 yu.. Antheridia 35 X 12 ^. Appendages 50 X 7 /x. 



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

 twenty in number, greatly flattened, the septa horizontal, a few of the 



