NEW LABOULBENIALES. 711 



appendage variable, the ]onji;er 85 ju, including both vertical (IS^i) 

 and horizontal (07 m) portions. Axis of the appendage al)out 20 ju, 

 the longest branches 28 /i; the antheridia 12X3.5/1. Protrusion 

 from subbasal cell of the receptacle 18 X 7 //. Total length to tip of 

 perithecium 58-68 n. 



On the upper posterior surface of the left wing of Ilythea sp., near 

 the base. No. 2514, Bocas del Toro, Panama. 



Although this species is closely allied to /. viomihriolahis-, it is at 

 once distinguished by the outgrowth from the subbasal cell of the 

 receptacle which is similar to that which arises from the secondary 

 stalk-cell in the last mentioned species. The form of the perithecium 

 and its appendage is also very different. Fifteen adult individuals 

 have been examined which were obtained from a host kindly collected 

 for me by Mrs. J. B. Rorer. 



Ilytheomyces minisculus nov. sp. 



Erect, straight above the subbasal cell, relatively slender; subbasal 

 cell hyaline, longer than broad, prominent externally. Axis of the 

 appendage blackened, the basal and subbasal cells indistinguishable, 

 the androphorous cell minute, obliquely separated, the paired antheri- 

 dia relatively pale, somewhat appressed, the remaining cells indis- 

 tinguishable, bearing two or three inferior blackened distally recurved 

 and few subhyaline superior branches, which are relatively slender and 

 tapering. Stalk-cell of the perithecium about as large as the subbasal 

 cell below it, deeply sufl'used with dark reddish brown, the hyaline 

 region above broader, tapering slightly downward, all the cells sub- 

 similar, longer than broad and externally convex; the perithecium 

 dark reddish brown, straight, nearW sjanmetrical, the inner margin 

 more convex, tapering slightly, its termination bluntly rounded, the 

 lips merely indicated by a slight irregularity, the left and the posterior 

 lip-cells combined to form a free, very slightly upciu'ved, bluntly 

 tipped prolongation, diverging at an angle of about 45°, the left half 

 pale brown, the posterior hyaline; the lip-cells misplaced by a quarter 

 turn of the whole series of wall-cells, as a result of which the left and 

 the posterior lip-cells both become anterior; while the right and 

 anterior occupy the posterior (inner) side. Spores about 22 X 2 ^t. 

 Perithecia 48-50 X 15 /i; the stalk-cell 9 X 7.5 ju; the hyaline region 

 above it 18 X 14 m; its terminal projection 15 X 5/x. Axis of the 

 appendage 30 /x, its longest branches 35 fx, the antheridia 12 fx. Total 

 length to tip of perithecium 70-90 /jl. 



