SPH^EIACEl. 807 



2421. Dothidea pteridis. Fr. " Bracken frond Dothidea." 



Hypophylloiis, following the veins, elongated, cinereous-black, 

 opaque, internally black ; ostiola minute, slightly prominent ; 

 asci clavate ; sporidia elongated, triseptate, hyaline. — Fr. SJI. 

 ii.p. 555. Beb. 1. 1,/. 3. Fries exs. no. 67. Schm. exs. no. 2. CooJce, 

 Fern Book p. 20, Jig. 7-9. Fclcl. exs. no. 1016. Phyllacliora pteri- 

 dis, Fckl. Sym. Myc.p. 218. 



On fronds of Pteris aquilina. 



Fuekel states that the spermogonia of this species will be found in Fusi- 

 dium pteridis, Rabh. F.E. no. 389. 



Sect. 2. Caulicolce. 



2422. Dothidea tetraspora. B. 4' Br. "Four-spored 



Dothidea." 



Stroma pulvinate ; cells immersed or subprominent ; asci cy- 

 lindrical, tetrasporous ; sporidia uniseriate, uniseptate, obovate, 

 constricted in the middle. — B. ^- Br. Ann. N.H. no. 899, ^.11, 

 /.39. 



On dead twigs of Dapluie laureola and Ulex. Feb. Moss- 

 burnford. 



Stroma pulvinate, black, either quite even or studded with the projecting 

 cells ; asci cylindrical, containing four sporidia arranged in a single row ; 

 sporidia (OOl-'OOlS in.) •025 -03 m.m. long, obovate, uniseptate, yellow- 

 brown, the lower articulation generally shorter and narrower j very rarely 

 there is a third septum.— B, ^' Br. 



2423. Dothidea melanops. Tul. " Beech Dothidea." 



Microstylospores spermatia-like, narrowly cylindrical, straight ; 

 macrostylospores oblong-lanceolate. 



AscopHORE. — Rounded, irregular, plane or depressed, black, 

 very smooth, bursting through stellate fissures in the bark. Asci 

 large, oblong-cylindrical, very obtuse ; sporidia subelliptic, a 

 little constricted towards each end, pallid, granular or nucleate. 

 —Tul. Carp. u.p. 73, t. 10. B. ^'. Br. Ann. N.H. (1866), no. 

 1179. 



On beech. Jedburgh. 



Sporidia (-0008 -001 in.) •025--035 m.m. long (•0004--00'5 in.), 'OIS-'OIG 

 m.m. broad. 



2424. Dothidea ribesia. Pers. " Currant Dothidea." 



Erumpent, subelliptic, depressed, black, of the same colour 

 within ; cells very small, white, seated near the surface ; conidia 



