725 



racemosa, Newfield, N. J., Bethlehem, Pa. (Schw.), New York State 

 (Peck). 



The perithecia are generally circumscribed by a black line pene- 

 trating the wood. According to Schweinitz, the perithecia arise from 

 the surface of the inner bark and never from the wood. 



CI. Vaccinii, (Schw.) 



Hysteriunt Vaccinii, Schw. Syn. N. Am. 2088. 



Erumpent, large, elongated, ovate, brownish-black, much larger 

 than Sporomega Ledi, to which it is allied. Lips thin; disk rufescent, 

 erumpent and surrounded by the bark. 



On old branches of Faccmm??iyro»ic?osMOT, Bethlehem, Pa. (Schw). 



The specimen in Herb. Schw. apparently belongs here, but affords 

 no fruit. 



FAMILY. DICflJlNACEiE. 



Perithecia round or elongated, simple, covered, raising the epi- 

 dermis into pustules, finally erumpent, membranaceous or coriaceo- 

 membranaceous, black, opening by a cleft across the apex. 



DICHiENA, Fr. 



Summa Veg. Scand. p. 403. 



Perithecia orbicular or elongated, simple, innate-erumpent, cori- 

 aceo-membranaceous, opening by a cleft across the apex, mostly in 

 densely crowded patches. Asci saccate or subelongated, 8-spored. 

 Sporidia oblong or oblong-elliptical, 2-3-septate, subhyaline, mostly 

 biogenous. The place of this genus in the mycological system is 

 uncertain. It was formerly classed with the lichens. It differs from 

 the HysteriacecB in its membranaceous and at first buried perithecia. 

 The ascigerous state is seldom met with, but the pycnidial stage 

 {Psilospora, Kab.) is common. 



D. quercina, (Pers.) 



Opegrapha quercina, Pers. in Ann. Bot. VII, p. 31, tab. 3, fig. 4. 

 Schizoderma quercinum, Chev. Flor. Paris, p. 43S, tab. 11, fig. 21. 

 Opegrapha macularis, Ach. Wchen. Univ. p. 247. 



Dichana quercina, Fr. Elench. II, p. 142. \ 



Exsicc. Fckl. F. Rh. 1966.— M. & N. Stirp. Vog. 265.— Sydow, M. March. 384.— Rav. F. 

 Am. 71, 640.— Roum. F. G. 995.— Ell. N. A. F. 793. 



Perithecia erumpent, on round or transversely elongated, black, 

 crustaceous spots \-\ cm. or more across, subglobose or conic-globose, 

 louo-h brownish-black, |-1 mm. diam., or subelongated, membrana- 



