330 



MONOGRAPH OF THE LABOULBENTACE^E. 



This small species is allied to L. parvula in general form, but is at once separable by its 

 stouter curved appendages. It occurs only on the legs of the host mentioned, usually in small 

 numbers, and is very constant in its characters. 



Laboulbenia recta Thaxter. Plate XIV, figs. 27-28. 



Proc. Am. Acad. Arts and Sci. Vol. XXVII, p. 42. 



Olivaceous. Perithecium straight, rather small, symmetrically inflated, the short, almost 

 truncate, black apex abruptly distinguished ; the wall-cells distinctly spiral. Outer appendage 

 consisting of a basal cell bearing distally a terminal and on the inner side a sub-terminal branch ; 

 each usually once branched above its basal cell : the inner appendage consisting of a much 

 smaller basal cell, producing two branches, each of which may be once branched, the ultimate 

 branchlets of both appendages stiff, erect or diverging slightly towards the perithecium, taper- 

 ing slightly, rather closely septate and about equal. Receptacle long, straight and rather 

 slender. Spores, 75-80 x 6-7 /x. Appendages, longest, 200-250 fi. Perithecia, 150-180 x 50- 

 75 fj>. Total length to tip of perithecium, 350-430 



On Platynus extensicollis Say, Maine and Connecticut. 



This rare species was found in several localities about New Haven and at York, Maine, 

 attached to the anterior legs of its host in company with L. scelophila, which is, perhaps, its 

 nearest ally ; although readily distinguished by its smaller size, different shape and curved 

 appendages. It is one of the few species in which the longitudinal series of wall-cells of the 

 perithecium have a spiral twist. 



Laboulbenia cristata Thaxter. Plate II, figs. 2-3 ; Plate XVII, figs. 24-29. 



Proc. Am. Acad. Arts and Sci. Vol. XXVIII, p. 174. 



More or less suffused with brown. Perithecium curved outward, evenly, often deeply, 

 suffused with brown, tapering to the neck-like apex, its prominent lips turned outward, the base 

 of the inner lip more deeply suffused. Appendages two, the outer consisting of a large, squarish 

 cell surmounted by a sub-basal cell which bears on its upper flattened surface a series of from 

 three to six large, straight, simple, septate dark red-brown branches set side by side antero-pos- 

 teriorly in a single row, the inner very long, the outermost basally deeply blackened and con- 

 tracted, curved strongly outward, its hyaline sub-erect distal portion commonly broken off. The 

 inner basal cell very small, producing usually two short branches bearing groups of large, long- 

 necked antheridia. Trichogyne large, branched and septate, the ultimate branches straight and 

 tapering. Receptacle short, stout, hyaline, becoming tinged with yellowish brown. Cell I small, 

 cell II very large, all very thick-walled. Spores, 50-55 x 4-4.5 fi. Perithecia, 110-1 30 x 37-45 p. 

 Appendages (outer, not including two basal cells), 90-480 basal cells, 35 \i. Total length to 

 tip of perithecium, 250-280 //.. 



On Pcederus littorarius Grav., and P. obliteratus Lee, Maine ; Pcederus sp.? Mexico and 

 Nicaragua ; Pcederus ruficollis Fabr., Austria. 



