632 



On the bark of various species of Rhus, around Bethlehem, Pa. 



The above notes are from the spec, in Herb. Schw. The diagnosis 

 given in Syn. N. Am. is as follows: Thick, elevated, abbreviated, 

 more or less four-sided, often irregularly sublobate, base attached to 

 the bark, with the margin rather acute, flattened-undulate and rough 

 above. Perithecia rather large, pyriform, deeply immersed, but not 

 sunk to the base of the whitish stroma, slightly prominent above. 

 Ostiola very short, open, perforated ; stroma at first dirty-olive, then 

 black. The small stromata are so narrow and thick as to resemble 

 a thick-stemmed Peziza. It is evident that the specc. issued in 

 N. A. F. and elsewhere as Diatrype quadrata, Schw., cannot be the 

 species here described. 



H. argillaceum, (Pers.) 



Sphceria argillacea, Pers. Syn. p. 10. 

 Hypoxylon argillaceum, Berk. Outl. p. 387. 

 Kxsicc. Rab. F. E. 247. 



Stromata erumpent-superficial, subglobose, solitary, rarely con- 

 nate, clay-color, becoming black within. Perithecia in a single layer 

 (monostichous), rarely irregularly polystichous, ovate, small, crowded, 

 somewhat prominent, minutely mammillose, conidial layer white, 

 becoming stag-color or clay-color; conidia small, ovate, hyaline on 

 long, sparingly branched, septate sterigmata. Asci cylindrical, with 

 very long, slender pedicels, spore-bearing part 140x16 p.. Par- 

 aphyses simple, thread-like, longer than the asci. Sporidia uniseriate, 

 broad ovate, elliptical or subinequilateral, obtuse, opake, 18-22 x 

 9-10 ju, (22-24 x 10-12 fi. Sacc. in Syll). 



On trunks of ash ; more rarely on beech and birch, Bethlehem, 

 Pa. (Schw.), Canada (Maclagan), on beech, New York (Peck). 



This species, of which we have seen no specimens except those 

 sent from England by Dr. Plowright, seems to be easily recognized by 

 its clay-colored stroma and large sporidia. 



H. notatum, B. & C. Grev. IV, p. 50. 



EJxsicc. Rav. F. Car. IV, No. 36. 



" Perithecia few, rather large, crowded into a little pulvinate mass 

 clothed with rubiginous powder. Ostiola at length prominent, trun- 

 cate, with a central perforation. The sporidia, which are shortlj 

 cymbaeform, vary a little in size." 



On bark of Celtis, Carolina (Ravenel), on Viburnum, Pennsyl- 

 vania (Michener). 



In the specimens in Rav. Exsicc. (the only ones we have seen), 

 the little pulvinate, erumpent stroma are 1-2 mm. across/each con- 



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y 



