523 



The measurements of asci and sporidia are from specc. in the 

 Exsiccati cited. The original diagnosis makes each of the two cells of 

 the sporidia constricted in the middle and 2-nucleate, but in only a 

 few of the sporidia was there any constriction except the central one, 

 qr any nuclei visible; in all of them, however, there was a distinct 

 hyaline envelope and generally a small, subglobose apiculns at each 

 end. The Iowa specimens are in no way distinguishable from the 

 European except in being accompanied by a Melunconium (31. zona* 

 turn,, E. & E.). 



The characters agree so well with Melanconis that we have not 

 hesitated to refer the specc. to that genus. 



M. modonia, Tul. Sel. Carp. II, p. 141, tab. XV, figs. 1-6. 



Exsicc. Fckl. F. Rh. 2006. Rehm Asc. 379. Thum. M. U. 1062. EH. & Evrht. N. A. F. 



2d Ser. 1564. 



Perithecia 3-12 (or more), subcircinate in the slightly blackened 

 inner bark, globose, about \ mm. diam., their long, converging, cylin- 

 drical necks piercing the roundish, dirty gray disk, with their short, 

 obtuse ostiola only slightly prominent. Asci cylindrical, obtuse above, 

 attenuated below, 8-spored, 150-200x12-15 //, with abundant par- 

 aphyses. Sporidia irregularly biseriate, elliptical or elliptic-oblong, 

 obtuse, uniseptate and constricted in the middle, hyaline (slightly 

 brownish when mature), 27-35 x 1113 //. 



On dead limbs of Castanea, Newfield, N. J. 



The young stromata produce an abundance of conidia, ovate, 

 obovate, ovate-lanceolate, or pyriforni., straight or slightly curved, 

 dark brown, 2-8-septate, 20-60x10-13 p.. 



M. thelebola, (Pr.) 



Sphcerta thelebola, Fr. S. M. II, p. 408. 



Aglaospora thelebola, Tul. Sel. Carp. II, p. 161, tab. XXI, figs. 1-18 

 Melanconts, tfuelebola, Sacc. Syll. 2350, Cke. Syn. 2059. 

 Exsicc. Thum. M. U. 362. Vize. Micr. Fungi, 168. Sydow, M. March. 1722. 



Perithecia circinate, \-\ mm. diam., 4-5 in a stroma formed of the 

 scarcely altered substance of the bark, and surrounded by a faint cir- 

 cumscribing line. Ostiola decumbent, convergent, their globose, at 

 first papilliferum finally umbilicate ostiola erumpent in a subelliptical 

 disk, which raises the epidermis into pustules soon ruptured at the 

 apex. Asci clavate-eylindrical, obtuse, 110-130 x 15-18 //, 8-spored, 

 paraphysate. Sporidia biseriate, cylindrical, slightly curved, septate 

 in the middle, but only slightly or not at all constricted, obtuse, hya- 

 line, with a setaceous, hyaline, deciduous appendage at each end, 30- 

 45 x 8-10 fi (40-60 x 10-1 2 p., Winter). 



On dead alders, New Jersey, New York (Peck), Canada (Macoun), 

 on Juniperus Virginiana Pennsylvania (Schw.). 



