SPH^RIACEl. 



809 



On stems of Pteris aquilina. Common. 



According to Fuckel {Syyn. Myc t. vi./. 31) the sporidia are triseptate, with 

 a short hyaline appendage at either end. 



Sect. 3. Lichenicolce. 

 2428. Dothidea Piggotii. B. & Br. '* Lichen Dothidea." 



Orbicular, innate, surface papillate witli the tips of the cells ; 

 asci short, clavate ; sporidia biseriate, obovate or cymbiforni tri- 

 septate, — B. ^ Br. Ann. N.H. no. 660. Spkceria homostegia, 

 Nyl. Flor. (1857),^. 688, Homostegiaadusta, Fckl. Sym. Myc. p. 

 224. Fckl. exs. no. 953. 



On Parmelia saxatilis. Aug. "Wales. 



Forming little patches about a line broad completely adnate with the 

 thallus ; surface opaque, black, papillate with the protruding tips of the 

 semi-immersed cells, whose walls are black, but separated from each other 

 by pellucid vertical cells running down below into hyaline subhexagonal cells 

 with thick walls, Asci short, broad, subclavate; sporidia brown, biseriate, 

 obovate, cymbiform, slightly curved, triseptate, very rarely quadriseptate. — 

 B. (t Br. 



Dr. Lauder Lindsay has found a Dothidea somewhat resembling this ex- 

 ternally, but much smaller, on a Parmelia. The fruit was immature, the 

 short asci being filled with granules. The patches were about one-third the 

 size of those in D. Piggotii. 



* C. Valsei. 



Stroma determinate, verrucaeform. Perithecia im- 

 mersed in stroma ...... 



Perithecia circinating, ending in a disc 



Perithecia circinating. Conidia in a black mass, 

 often oozing out ....... 



Diatrypt. 

 Valsa. 



MelancoTiis. 



Gen. 349. 



DIATRYPE, Fr. 



Fig. 3S5. 



Stroma determinate, verruc^eform ; 

 perithecia immersed in the stroma ; 

 sporidia hyaline, or coloured. — Fr. 

 Berk. Outf.p. 387. (Fig. 385.) 



Section 1. Asci many- 



spored Diatrypella. 



Section 2. Asci eight- 



spored Diatrypegenuina. 



2m 



