SPHiERTACEI. 885 



lar^e, round and very flat, seated on a dense subiculum, usually entirely 

 hidden beneath the bark, not erurapent, but raising the bark into smooth, 

 rounded, or elongated swellings ; perithecia and subiculum usually of a dark 

 dirty-green tinge. — F.C. 



2854. Sphseria pruinosa. Fr. " Frosted Sphaeria." 



Gregarious ; perithecia covered, depressed, adnate with the 

 epidermis, frosted with grey meal ; ostiola bursting forth in a 

 buUate manner. — Fr. S.M. ii. p. 486. Fries, exs. no. 82. Moug. 

 exs. no. 968. Eng. Fl. v. p. 269. Berk. exs. no. 85. 



On ash twigs. Spring. [Mid. & Up. Carolina.] 



Easily known when perfect by the grey frosted perithecia, which are deeply 

 nmbilicate beneath, by collapsing an I separate, together with the epidermis, 

 from the inner bark ; sometimes, however, they are retained by the bark, 

 and in that case the mealiness is seen only with great difficulty. Ostiola 

 bursting through the cuticle and making the matrix rough, like a nutmeg 

 grater, pierced with a round, depressed orifice, — M.J.B. 



2655. Sphaeria vibratilis. Fr. " Hidden Sloe Sphasria." 



Scattered ; perithecia entire, covered, globoso-depressed, even, 

 black ; ostioluni verv minute, latent ; sporidia cylindrical, curved, 

 minute, hyaline. — Fr. S.M. \\. p. 482. Fries, exs. no. 315. Eng. 

 Fl.y. p. 278. Crf/pto^phceria vibratilis, De Not. Schema p. hi . 

 Micro. Ital. viii. 10. Calosphceria vibratilis, Nke. Pyr. Germ. p. 97. 



On dead sloe. 



When the epidermis is stripped off and held to the light, it is found to be 

 perforated by the minute ostiola, though externally there is but a very slight 

 indication of the presence of the perithecia.— J/./.S. 



" Sporidia uniseriate, pale-brown, oblong-elliptic, slightly curved ; endo- 

 chrome bipartite."— Curr. Linn. Trans, xxii./. 74. 



2656. Sphaeria xnillepunctata. Grev, " Thousand Point 



Sphaeria." 



Scattered ; perithecia globose, persistent, black ; ostiola slightly 

 prominent, very minute punctiform, flattened ; sporidia biseriate, 

 or crowded, pale-brown, curved. — Grev. t. 201. S. corticis, Sow. 

 t. 372, /. 5. Fr. S.M. ii. p. 481. Curr. Linn. Trans, xxii. t. 59,/. 

 108. Fchl.exs.no. 908. Berk. exs. no. ^^. S.populina, Pers. Ic. 

 Pict. t. 21, f, 5, 6. CryptosphcBria millepunctata, Fckl. Sym. Myc. 

 p. 212. 



On ash twigs. Common. 



At first sight from the smoothness of the branches on which it grows re- 

 sembling a Verrucaria. Sporidia (•0006-*0012 in.) '0i5-'03 m.m. long. 



