THAXTER. NEW LABOULBENIACE.E. 411 



lower cells having appendages on only one side or none, the rest bearing 

 them on both sides. Appendages simple, consisting of from five to seven 

 cells including the basal cell, constricted at the dark septa, the terminal 

 cell hyaline and much larger, as in the male ; the rest, except the basal 

 one, purplish or the upper one tinged with brown. Perithecia one to 

 three in number, mostly rather slender, slightly curved outward; the 

 stalk portion about half as long as the remainder, which is purplish 

 brown, deeper distally ; the tip well distinguished when not distended 

 by spores, consisting of a basal portion larger and slightly inflated and 

 a distal one, formed by the lip-cells, abruptly distinguished, its external 

 margins generally symmetrically divergent, the four cells nearly equal 

 and symmetrical and ending distally in a corresponding number of 

 papillae about the pore. Perithecia including stalk, 125 X 20 //,. Re- 

 ceptacle 190-225 X 28 //., not including basal cells of appendages. 

 Appendages 55 X 8 /a. 



On Ardistomis pp., Hope Collection, No. 29 G. No locality, but 

 probably Mexico or South America. At base of elytra and ou leg. 



Dimeromyces nanomasculus nov. sp. 



Male individual very minute, consisting of three superposed cells, the 

 upper bearing a terminal two-celled appendage with dark septa, the sub- 

 basal cell giving rise to a single antheridium like that of D. pinnatus, 

 smaller, the neck usually abruptly turned to one side. Total length to 

 tip of appendage 35 t x ; the antheridium about 15 X 5 /i. 



Female individual resembling that of D. pinnatus in general structure, 

 the basal cell large and long, narrower below ; the cells above about ten 

 to fifteen in number, usually roundish ; the appendages mostly five-celled 

 above their basal cell, variably suffused with brown, the septa dark, some- 

 times curved or almost hooked distally, the distal cell not conspicuously 

 enlarged becoming brownish ; the subterminal cell of the single terminal 

 appendage examined producing a blackish-brown, lateral, irregular, spine- 

 like outgrowth. Perithecium straight, more commonly solitary near the 

 tip, brownish yellow to dark brown, not at all distinguished from the 

 stalk, which is hyaline only at its narrow base, the hyaline tip abruptly 

 distinguished by a slight subtending ridge, its margins usually converging 

 symmetrically to the truncate or blunt apex. Spores about 45 X 3 /a. 

 Perithecia, including stalk, 100-120 X 20-24 /x. Appendages longer 

 60 X 6 jx. Total length to tip of perithecium 245-285 X about 22 /j. 



On Ardistomis viridis Say, Cocoanut Grove, Florida. November. 

 On A. educta Bates, British Museum (Biologia Collection), No. 676. 



