337 



lieiit, at first covered by the cuticle, soon exposed. Asci clavate. 

 Sporidia muriform, 50 x 20 fi, larger than in PI. herharum. 

 On dead stems of Trifolium pratense, Newfield, N. J. 



PL thuriodonta, (C. & E.) 



^phcsria thuriodonta^ C. & E. Grev. V, p. 94, 

 Pleospora thuriodonta^ Sacc. Syll. 3768. 

 Delacourea thuriodonta, Cke. Syn, 4328. 



Perithecia covered by the epidermis, sonie-\vhat prominent, scat- 

 tered. Asci cylindrical. Sporidia uniseriate, elliptical, brown, 25 x 

 10 ^, 5-septate and muriform, constricted at the middle septum. 

 Accompanied by stylospores (in other perithecia) elliptical, uniseptate, 

 brown, 40 x 20 /i. 



On dead limbs of Nyssa multifiora, Newfield, N. J. 



Apparently rare. Has only been met with once, and then only 

 in small quantity. 



PI. Thumeniana, Sacc. Syll. 3787, Mich. II, p. 139. 



Perithecia gregarious, semiimmersed, at first covered by the epi- 

 dermis, subglobose-depressed , papillate, \ mm. diam., rather solid. 

 Asci cylindrical, short-stipitate, rounded at the apex, 90-100 x 15 /^, 

 paraphysate, 8-spored. Sporidia biseriate, oblong-biconical, 18-20x 

 7-8 /i, 3-septate, constricted in the middle, with one or two longi- 

 tudinal septa, cribrose-guttulate, olivaceous. 



On dead leaves of Yucca aloifolia, Carolina (Ravenel). 



PI. laxa, Ell. & Galway Journ. Mycol. V, p. 66. 



Perithecia scattered, subglobose, black, 150-170 p. diam., their 

 bases projecting on one side of the leaf and their apices on the other. 

 Asci few (6-8 in a perithecium), inflated-oblong, broadly rounded 

 above, 150-200 x 35-55 fi, contracted at base into a short stipe. Par- 

 aphyses obscure. Sporidia 8 in an ascus, obovate-oblong, 6-8-septate 

 and coarsely muriform, deeply constricted near the middle, so as to 

 easily break in two there, straw-yellow, 35-45 s 15-20 fi (mostly 15 n 

 wide). This seems to differ from any of the other described species 

 on grasses and Carices, in its strongly constricted sporidia. This 

 character is very distinct through all the stages of growth. The con- 

 striction is generally at the third septum from the upper end, the part 

 above this constriction being broader and shorter than the part below 

 it This comes near PL Islandica, Johans., but has the sporidia much 

 more deeply constricted. 



On dead leaves and culms of some grass, Montana (Anderson). 



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