699 



longitudinally dehiscent, opening central, sometimes abbreviated and 

 distinctly labiate. 



On fragments of willow wood, Bethlehem, Pa. (Schw.). 



H. Rhois, Schw. Syn, N. Am. 2092. 



Scattered, short, ovate or subrotund, convex-globose, black, not 

 shining, glabrous. Lips distant, leaving a wide opening. Subim- 

 mersed among the fibers of the wood, minute, appearing to the naked 

 eye like black specks. 



Rather rare, on rotten wood of Rhus typhina, Bethlehem. Pa. 

 (Schw.). 



H. nucicola, Schw. Syn. N. Am. 2080. 



Seated on a black crust. Perithecia ovate-hemispherical, strong- 

 ly convex, the elongated orifice subimpressed, acute ,closed, otherwise 

 glabrous, of a brownish-black color, crowded together in various posi- 

 tions, transverse, parallel and mixed. 



On old hickory nuts, Bethlehem, Pa. (Schw.). 



The specc. in Herb. Schw. have the outward appearance of 

 Glonium parvulum, Ger., but are entirely without fruit. 



H. Kalmiae, Schw. Syn. N. Am. 2091. 



Perithecia immersed among the fibers of the wood, at length 

 longitudinally erumpent, very long, linear, straight, acuminate at the 

 ends, confluent, very black. Lips thin, subturgid, gaping, with a rather 

 broad opening. 



On partly rotten wood of ITalmia, erumpent among the fibers of 

 the wood and covered by them, Bethlehem, Pa., (Schw.). 



H. fibritectum, Schw. Syn. N. Am. 2095. 



Erumpent, gregarious, covering patches often an inch across 

 among the loosened fibers of the wood. Perithecia semiimmersed, 

 black, broad-ovate, abruptly acuminate at each end, generally some- 

 what flattened above, sides convex, opening broad, margined, at first 

 closed. 



On old willow wood, Bethlehem, Pa. (Schw.). 



The specimens of the following species in Herb. Schw. do not belong 



to Hysterium. 



H. librincola, Schw. Syn. N. Am. 2101. 



This pertains to the SphceriacecB, but can not be determined from 



