707 

 H. hiasceus, Rehm Asc. No. 314. 



Exsicc. Rehm Asc. 314.— Rab. F. E. 3564.— Ell. N. A. F. 151. 



Scattered, superficial, narrow-elliptical, hardly over 1 mm. long, 

 black; lips incurved, open so as to expose the narrow disk. Asci 

 clavate-oblong, obtuse, subsessile, paraphysate, 8-spored, 100 x 20-25 fi. 

 Sporidia irregularly crowded, oblong-elliptical, mostly a little curved, 

 6-8-septate, with a longitudinal septum generally running through all 

 the cells, 22-27 x 8-10 /i. 



On bark of Quercus hicolor and Celtis occidentalis, in Carolina, 

 on bark of Quercus coccinea, Newfield, N. J. 



Generally accompanied hj Ifysterium pvlicare, Fers. The asci 

 and sporidia are much like those oi H. Syringm, Schw., but the peri- 

 thecia are rather larger and more obtuse. Hysterium hiascens, B. & C. 

 Grev. IV, p. 11, is said to be different and referable to the Di&comy- 

 cetes. We have never seen it. 



** Perithecia discoid; sporidia yellowish (Pseudogr aphis). 

 H. elatina, (Ach.) 



Lichen elatinus, Acharius Prodr. Ivich. p. 22. 

 Lecanora elatina, Ach. Lich. Univ. p. 387. 

 Hysterium elatinum, Pers. Syn. p. 28. 

 Pseudographis elatina, Nyl. Herb. Mus. Fenn. p. 96. 

 Krempelhuberia Cadubries, Massal. Geneac. p. 15, No. 21. 

 Exsicc. Rab. Herb. Mycol. 709.— Rehm Asc. 25. 



Perithecia gregarious, round or irregular, rounded-angular or 

 elongated-elliptical, obtuse, at first sunk in the bark which is raised 

 into a pustule and then laciniately torn, suberumpent, closed at first, 

 then with an elongated or laciniate opening above and widely exposing 

 the reddish-yellow disk, rough, black, carbonaceous, 1-2 mm. across. 

 Asci cylindrical, 180-250x15-18 fx, 8-spored. Sporidia uniseriate, 

 oblong-ovate, straight or slightly curved, 1-7 -septate, and finally muri- 

 form, hyaline or yellowish, 21-30 x 10-14 /i. Var. crispum, (Pers.), 

 reported by Schweinitz as found in Carolina and Pennsylvania, on 

 bark of pine trees, differs in having much longer and narrower, more 

 curved and flexuous perithecia with thin, crisped lips and black disk. 



This genus and species is placed by Dr. Rehm (Die Pilze) in the 

 Discomycetes, Fam. Pseudophacidiece, where it evidently belongs; 

 but as the species has hitherto been classed among the HeysterinecB, 

 and will quite likely be sought for in that Family, we leave it there 

 for the present. 



*** Sporidia hyaline [Oloniopsis). 



H. Cookeiknura, Ger. Bull. Torr. Bot. Club, V, p. 77. 



Perithecia erumpent-superficial, black, not striate, linear-elon- 



