MONOGRAM OF THE LABOULBENIACEJE. 



343 



position of the branches. It is evidently related to L. Schizogenii and its allies, but cannot be 

 contused with any described species. It appears to be a rare form and occurs scattered hero 

 and there on various parts of its host. 



Laboulbenia Schizogenii Thaxter. Plate XXI, figs. 13, 15. 



Proc. Am. Acad. Arts and Sri. Vol. XXVII. p. 43. 



Perithecium blackish brown, deeper below the tip, sometimes nearly opaque, rather short 

 and stout, inwardly inflated and united with the receptacle to its very tip ; the hyaline extremi- 

 ties of the lip-cells only free, and bent slightly outward. Appendages arising from a black 

 insertion-cell, consisting of two basal cells, which may be longitudinally several times divided, 

 bearing distally two to several nearly hyaline branches, which may in turn be several times sub- 

 dichotomously branched, the ultimate branchlets flexuous. Receptacle hyaline or straw colored, 

 sometimes distally suffused with brown, bulging outward prominently and evenly in the region 

 of cells III-V ; cell V elongated towards the tip of the perithecium, carrying the insertion- 

 cell outward free from the perithecium. Spores, 70 x 5.5 fi. Perithecia, 100-125 x 50-55 ll. 

 Appendages (longer), 270 ll. Total length to tip of perithecium, 350-450 ll. 



On Schizogenius lineolatus Say, S. ferrugineus Putz., and Clivina cordata Patz.,New England. 



This well marked species is quite rare, never occurring in any great abundance on any 

 single host. It is subject to but slight variations, except in the basal cells of its appendages, 

 although small specimens like that represented by fig. 14 sometimes occur. It is most nearly 

 related to L. Clivince. The hosts are found commonly under stones on the borders of ponds. 



Laboulbenia Philonthi Thaxter. Plate XXII, figs. 26-30. 



Proc. Am. Acad. Arta and Sri. Vol. XXVIII, p. 174. 



Perithecium rather narrow, beginning to taper almost from its base to the somewhat coarse- 

 lipped apex, both margins often almost straight. Appendages consisting of two basal cells, the 

 inner producing several (two to five) branches, which arise by successive proliferations on either 

 side, forming two rows running side by side antero-posteriorly : the outer appendage and the 

 branches of the inner erect, simple, rather rigid, tapering considerably, two or three of the 

 lower septa blackened, the cells between them distinctly inflated. Receptacle hyaline or slightly 

 suffused, normal, except that the basal cell is sometimes hoof-shaped, a portion of it blackened 

 and continuous with the foot. Spores, 52 x 4 ll. Perithecia, 160-185 x 50-70 ll. Appendages 

 (longer), 325 ll. Total length to tip of perithecium, 400-450 ll ; longest, 590 ll. 



On Philonthus cunctans Horn, P. micans Grav., P. debilis Grav., and numerous undeter- 

 mined species, New England ; P. cequalis Horn, Lake Superior; P.furvus Nord., California. 



This species is by no means uncommon on all parts of its hosts, and may be recognized by 

 the peculiar form of its perithecium and the rigid, erect branches of its appendages, the 

 inflated basal cells of which recall those of L. inflata. The insertion-cell is not very deeply 

 blackened, and a hyaline pointed portion is more or less distinct between and below the two 

 4>asal cells of the appendages. The inner of these cells appears to become divided into a num- 



