722 



As there seem to be no decided characters separating Colpoma, 

 Wallr., and Sporomega, Corda, we have followed Dr. Rehin (Die 

 Pilze, III, p. 101) in merging these two genera in Clithris, Fr., which 

 has precedence, and with which Colpoma, at least, is synonymous, but 

 have retained the genus in the Hypodermiew, between which and the 

 Discomycetes, its affinities are about equally divided. 



* Perithelia gray-pruinose outside (Colpoma). 

 CI. quercina, (Pers.) 



Hysterium quercinum, Pers. Syn. p. ioo. 

 Cenangium quercinum, Fr. S. M. II, p. 189. 

 Triblidium quercinum, Pers. Mycol. Eur. I, p. 333. 

 Colpoma quercinum, Wallr. Fl. Crypt. Germ. II, p. 423. 

 Hysterium nigrum, Tode, Fungi Meckl. II, p. 5, tab. Ill, fig. 64. 

 Sphceria collapsa, Sow. Eng. Fungi, tab. 373, fig. 3. 

 Variolaria corrugata, Bull. Champ, p. 117, tab. 432, fig. 4. 

 Exsicc. Desm. PI. Crypt. Ed. I, 383. Thum. M. U. 369. Rehm Asc. 27. Kriegr. F. Sax. 

 184. Sydow, M. March. 344. Vize, Micr. Fungi, 269. 



Perithecia ovate-oblong, transverse, convex or semicylindrical 

 from a flattened base, dark brown, opake, variable in size, at first sub- 

 cuticular and closed, then rupturing the epidermis and disclosing the 

 elongated, pale, boat-shaped disk, soon becoming friable and falling- 

 out. Asci clavate, long-stipitate, apex acute, 135 x 8-10 p, 8 -spored, 

 with filiform paraphyses. Sporidia filiform, fasciculate, equal, 90 x 

 l\ /i, at length multicellular, hyaline. Spermogonia orbicular, cov- 

 ered, 1-celled. Spermatia cylindrical, curved, 8 x 1 J p.. 



On branches of oak, South Carolina (Curtis). 



CI. lactea, (C. & P.) 



Colpoma lacteum, C. & P. 28th Rep. N. Y. State Mus. p. 69. 



Perithecia scattered, erumpent, thin, black, the longitudinally 

 ruptured epidermis closely appressed, disk plane, milk-white. Asci 

 cylindrical or clavate. Sporidia filiform, 20-30 p long. 



On dead stems of Ledum latifolium, Sandlake, N. Y. (Peck). 



When moist, the perithecium gaps widely, revealing the con- 

 spicuous white disk. This and the different habit distinguish the 

 species from CI. Ledi, (A. & S.). 



CI. Azaleae, (Schw.) 



Hysterium AzalecB, Schw. Syn. N. Am. 2089. 

 Colpoma Azalea, Cke. Disc. U. S. p. 36. 



Perithecia at first (nearly) covered by the epidermis which is 

 raised into oblong swellings over them, and soon cleft with a narrow 

 crack which is never more than partially open, mostly lying parallel 

 and often seriately confluent. Perithecia 2-4 mm. long, sometimes 





