69 



52 [X. Sporidia 4^8, inordinate, elliptical, narrowed at each end, con- 

 tinuous, smooth, hyaline, 55 x 30 fi. 



On dung of cows and sheep. 



We have included this species, though not aware that it has been 

 actually found, as yet, in this country. 



OOMYCES, B. & Br. 



Brit. Fungi No, 590 (1851). 



Perithecia included in a common, carnose-membranaceous stroma. 

 Asci linear. Sporidia filiform, continuous, hyaline. 



0. Langloisii, (E. & E.) (Plate 17) 



Coscinaria Langloisii^ K. & K- Journ. Mycol. 11, p. 88. 



Stromata tuberculiform, erumpent, soft, \-\ mm. diam., pale 

 flesh-color or horn-color when fresh, becoming nearly black when dry, 

 of rather close, membranaceous texture on the surface, softer and 

 looser within, surrounded by the ruptured epidermis, convex above. 

 Perithecia ovate, minute, with thin, transparent walls, 250-300 {i high, 

 and 150-200 fi broad, 20-30 in a stroma. Ostiola punctiform, not 

 prominent. Asci linear, 150-200x5 p., with filiform paraphyses 

 branched above. Sporidia filiform, nearly as long as the asci, hyaline, 

 continuous, 1 /ijthick. 



On dead stems of Vigna luteola, Louisiana (Langlois). 



A more careful examination of this curious production shows no 

 essential character to separate it from Oomyces to which we now refer 

 it. By some oversight this was placed on plate 17 with Sordariece, 

 and the following species on plate 7 with the Perisporiece. 



POLYSTIGMA, De Cand. 



Comment. Mus. Hist. Nat. t. Ill, p. 330 (et seq.) 



Stroma subcarnose, effused, colored (ochraceous, red or yellow), 

 phyllogenous. Perithecia immersed. Asci 8-spored. Sporidia ovoid, 

 continuous, hyaline. 



P. riibrum, (Pers.) (Plate 7) 



Xyloma rubrum, Pers. Syn. p. 105. 



Dothidea rubra, Pers. Fr. S. M. II, p. 553. 



Sphixria rubra, Fr. Obs. I, p. 172. 



Septaria rubra, Desm. Ann. Sci. Nat. Ser. II, t. XIX, p. 342. 



Polystigma rubrum, DC. I. c. p. 337. 

 Exsicc. Kunze F. Sel. 271.— Rab. Herb. Mycol. 562, 580.— Thum. Fungi Austr. 179, i8o. 

 id. M. U. 973.— M. March. 258.— Briosi & Cav. F. Paras. 12.— I,inhart Fungi Hung. 

 272, &c. 



Hypophyllous, suborbicular, slightly convex, 2-4 mm. across, 

 with an even margin, red, at length darker. Perithecia (cells) small, 

 immersed, reddish. Ostiola impressed, punctiform, becoming more 



