326 



MONOGRAPH OF THE LABOULBENIA CEJ5. 



stalk, gradually expanding upward and characteristically constricted at the common septum. 

 The species is most closely allied to L. elongata, but is always readily separable from this 

 species by the characters just mentioned. Although growing exposed to unfavorable conditions 

 near the tips of the anterior legs, it does not assume the short, compact form usually character- 

 istic of species developed in this position. 



Laboulbenia abcuata Thaxter. Plate XVIII, figs. 1-4. 



Proc. Am. Acad. Arts and Sci. Vol. XXIV, p. 268. 



Perithecium smoky-black, becoming uniformly almost opaque ; large, narrowed somewhat 

 towards the broad, bluntly rounded, less deeply colored tip, which is nearly symmetrical or bent 

 slightly inward. Outer appendage consisting of a rather large basal cell, from which arise one, 

 often two, branches, which may be simple or once or twice branched ; inner appendage arising 

 from a much smaller basal cell, which produces two branches, simple or sparingly branched, 

 bearing usually solitary antheridia laterally. Receptacle at first colorless, contrasting with the 

 dark perithecium ; but becoming slightly suffused with brown, the basal cell usually larger than 

 the sub-basal, and strongly curved. Spores, 65 X 5 p. Perithecia, 160-185 x 50-55 /x. 

 Appendages longer, 240 fi. Total length to tip of perithecium, 300-350 fi ; average, 320 yx. 



On Harpalus pennsylvanicus DeG., New England. 



This well marked and rather rare species is readily distinguished by its peculiar perithecium. 

 It occurs, so far as I have observed, only on the broad tips of the anterior pair of legs (usually 

 the left) of male individuals, where it is sufficiently conspicuous from its contrasting colors. 

 Though the abundant material obtained is all from New England, the species, together with the 

 remaining forms which inhabit the same host, are all doubtless widely distributed in the United 

 States. 



Laboulbenia Harpali Thaxter. Plate XIV, figs. 15-18. 



Proc. Am. Acad. Arts and Sci. Vol. XXIV, p. 13. 



Hyaline, becoming tinged with brown. Perithecium small, inflated below, tapering to the 

 clearly distinguished, deep blackish-brown tip ; bent sidewise from the receptacle, the lip-cells 

 turned outward from the evenly rounded, knob-like extremity to their hyaline tips, which form a 

 slight, pointed projection around the lateral external pore. Outer appendage consisting of a 

 usually somewhat rounded basal cell, from which arise two branches, simple or once to twice 

 branched, their branches rather rigid, tapering, all the cells rather short, inflated and constricted 

 at the septa : inner appendage consisting of a small round cell producing two branches, simple 

 or once branched below, and bearing, usually solitary, lateral antheridia, Basal cell of the recep- 

 tacle sub-cylindrical, commonly longer than the sub-basal, tapering but slightly to the blunt base ; 

 the septum between the two more or less oblique. Spores, 60-68 x 5-5.5 /a. Perithecia, 90 x 

 40 ijl. Appendages longer, 200-300 fi. Total length to tip of perithecium, 290 /* (215-300 /i). 



On Harpalus pennsylvanicus DeG., New England. 



This very common species is distinguished from all others by the peculiarly modified tip of 

 its small perithecium. It grows, appressed and densely crowded, invariably on the anterior 



