692 



black, effused, indeterminate crust in which the stipe is concealed. 

 Perithecia fragile, of medium size. 



We have given the diagnosis of this species, though it is uncer- 

 tain whether it has yet been found in this country. The specc. dis- 

 tributed in Ell. N. A. F. 858, are Mytilidion fusisporum, (Cke.). 



L. naviculars, Schw. Syn. N. Am. 2017. 



Not pedicellate, but contracted at base, elongated-ovate, sub- 

 flexuous, navicular, much like a Hysterium, especially in the young 

 state, before it becomes fully emergent, being then acuminate at each 

 end with a central fissure; but at a more advanced stage it becomes 

 compressed and longitudinally striate, conchiform, black and obtuse at 

 the ends. 



On wood, Bethlehem, Pa. (Schw.). A doubtful species. 



L. Sassafras, Schw., 1. c. 2018. 



Rather large, scattered, allied to L. mytilinum, but much larger 

 and more obtuse; subpedicellate, dilated above, rugose-striate, black, 

 not shining; aperture closed, nucleus white; sometimes opening in two 

 directions. 



On bark of Sassafras, Bethlehem, Pa. (Schw.). 



The fructification of this and the preceding species is unknown, 

 and the species are doubtful. 



HYSTERIUM, Tode. 



Fungi Meckl. II, p. 4. 



Perithecia superficial or erumpent, oblong or ellipsoid, corneo- 

 carbonaceous, opening with a longitudinal cleft. Asci clavate or 

 cylindrical, mostly 8-spored, paraphysate. Sporidia oblong or elon- 

 gated, 2-or more septate, brown. 



H. pulicare, Pers. Syn. p. 98. 



Hysterographium pulicare, Cda. Icones V, p. 77, tab. V, fig. 61. 

 Hysterium betulignum, Schw. Syn. N. Am. 2075. 

 Exsicc. Rehm Asc. 215. Kze. F. Sel. 375. Rab. F. E. 2644. Rav. F. Am. 762. Krieger, 

 F. Sax 437. EH. N. A. F. 457. Desm. PI. Crypt. Ed. I, 779. 



, Perithecia scattered or gregarious, superficial, variable in shape, 

 oblong, ellipsoid, longitudinally striate, black, lips obtuse, slightly 

 open exposing the linear disk, about 1 mm. long and | mm. broad. 

 Asci clavate. Sporidia subbiseriate, oblong, straight or slightly 

 curved, 3-septate, hardly constricted, the two end cells paler, straight 



