MONOGRAPH OF THE LABOULBENIACIiiE. 



341 



Laboulbenia Pachytelis Thaxter. Plate XX, figs. 9-12. 



Proc. Am. Acad. Arts and Sci. Vol. XXVIII, p. 173. 



Perithecium rather small, but slightly exceeding the receptacle, suffused with dark olive- 

 brown, becoming nearly opaque, tapering abruptly to the rather slender blackened tip, which is 

 bent slightly outward, the nearly hyaline lips outwardly oblique. Appendages two ; the outer 

 forming a sub-conical body composed of superposed flattened cells four to ten in number, each 

 cell giving rise externally to a single obliquely ascending, rather short, simple, stout, tapering 

 branch, blackened at its base, where a basal cell is cut off by a contrasting black septum. 

 The inner appendage consisting of a small basal and sub-basal cell separated by a blackened 

 septum, the upper giving rise directly to from one to three antheridia or hort sterile branches. 

 Receptacle short or elongate, nearly hyaline or becoming distally suffused with blackish brown, 

 normal, except for the unusual development of cell V, which extends along the inner margin 

 of the perithecium beyond the insertion of the appendages, pushing them outward free from 

 the perithecium. Spores, 66 x 7 p. Perithecia, 110-150 x 50 p. Outer appendage, without 

 branches, 90 long, the branches (longest), 180 fi. Total length to tip of perithecium, 300- 

 650 ix. 



On Pachyteles mexicanus Chaud., Mexico. 



This striking species is distinguished at once by its outer appendage, which cannot be mis- 

 taken for that of any other form. It is rather variable in size as well as in the structure of 

 its receptacle and its relation to the perithecium, which is more commonly that represented in 

 fig. 9. This individual, however, shows an abnormal septation of cell II. Numerous specimens 

 were obtained from the legs and inferior surface of its host. 



Laboulbenia Morionis Thaxter. Plate XXI, figs. 19-22. 



Proc. Am. Acad. Arts and Sci. Vol. XXVIII, p. 169. 



Pale straw-colored throughout except for a slight blackish brown shade below the apex of 

 the perithecium. Perithecium small, narrow, its whole inner margin connected with the recep- 

 tacle, beyond which the rather truncate hyaline tip projects. Appendages inconspicuous, con- 

 sisting of two basal cells, each of which may bear one to three short branches. Receptacle 

 elongate, slender, expanding but slightly toward its extremity without any abrupt enlargement, 

 the small blackened insertion cell carried outward with the appendages free from the perithe- 

 cium. Spores, 55 x 5 fi. Appendages, 40-50 fi. Perithecia, 110-125 x 30 /*. Total length to 

 tip of perithecium, 375-425 fi. Greatest width, including perithecium, 50 fi. 



On Morio Georgice Pal., Mexico. 



This singular species is distinguished by its narrow habit and small perithecium, which is so 

 closely united to the receptacle and so slightly distinguished from it that it appears at first sight 

 undeveloped. In some specimens the hyaline tips of the lip cells only are free beyond cell V. 

 The appendages are almost obsolete in some instances, and are more reduced than in any other 

 species. It seems undoubtedly allied to the species (£. Schizogenii and L. Clivince) occurring on 

 the allied hosts Clivina and Schizogenius. 



