682 



turn. Sporidia uniseriate, ovate, imiseptate and slightly constricted 

 at the septum, hyaline, 12-15 x 6-8 p.. 



On old decorticated wood of various deciduous trees, common. 

 G. pai'vnlnni, (Ger.) 



Hysterium parvulum, Ger. Bull. Torr. Bot. Club, V, p. 40 (1874). 



Gloninm parvulum, Sacc. Syll. 5597. 



Glonium microsporum, Sacc. M. Ven. Ser. IV, p. 25 (1875), F. Ital. tab. 121. 



Hysterium aggregatum and Hysterium abbreviatum, in Herb. Schw. (not //, 



aggregatum, Duby). 

 Exsicc. EH. N. A. F. 153. Rav. F. Am. 765. Sacc. Myc. Ven. 1281. 



Perithecia densely gregarious, or sometimes more or less scat- 

 tered, seated on a thin, black crust, short (|-1 mm. long), black, sub- 

 rotund or oblong, sometimes slightly curved, ends obtuse, flattened 

 above and marked with a longitudinal groove, on each side of which, 

 in well matured perithecia, are one or two faint striae. Asci cylin- 

 drical, subsessile, 55-60x5-6 //, paraphysate. Sporidia uniseriate, 

 oblique, rounded at the ends, hyaline, strongly constricted, about 

 7x3 /Jt. 



On decorticated wood of Alnus, New York (Gerard), on oak, 

 Newfield, N. J. 



A careful comparison of the American specc. of Glonium, parvu- 

 lum, (Ger.), with the spec, of G. microsporum, Sacc., in M. Veneta, 

 leaves no doubt that the two are identical. In Sacc. Syll. the sporidia 

 of G. parvulum are given as 15-18 fj. long. Gerard (1. c.) makes them 

 5-7 1 //long(.0002-.0003 in.),which is about the average length, though 

 some sporidia may reach a length of 8-9 //. The young perithecia are 

 generally quite flat on top, without any longitudinal groove, but this 

 appears later and is more distinct in the elongated forms. 



G. caryigenuiii, E. & E. (in Herb.) 



Perithecia gregarious, lying in different directions on the matrix, 

 .small (J-l mm. long), oblong, straight or slightly curved, ends obtuse, 

 lips open so as to leave a tolerably wide and deep groove or furrow. 

 Asci cylindrical, about 70 x 10-12 //, paraphysate, 8-spored. Sporidia 

 either uniseriate or quite as often biseriate, ovate, uniseptate, hyaline, 

 slightly constricted at the septum, 12-15x5-6 JJL. 



On an old decaying hickory nut lying on the ground, Newfield, 

 X. J. 



This seems different from Hysterium nucicola, Schw., in the 

 Absence of any black crust and the oblong, not ovate or hemispherical, 

 perithecia. The lips also leave a very distinct furrow between them. 



