440 



SPH^EONEMEI. 



1293. Filidium acerinum. Eze. "Sycamore Pilidium.'' 



Hypopliylloiis, liemispherical, black, splitting with from three 

 to five acute teeth, nucleus white; spores fusiform. — Kze. M.H. 

 ii.;?. 92,^. 2,/. 5. Fr. El.'ii.p.UQ. 

 On dead sycamore leaves. 

 Externally resembling a Phacidmm, but with different fruit. (Fi[/- 163.) 



1294. Filidium (?) carbonaceuxn. Lib. " Willow Pilidium." 



Perithecia irregular, dingy-brown, crowded into broad patches, 

 growing in a widely- effused more or less ambient subiculum ; 

 spores falciform, septate. — B. ^. Br. Ann. N.H. no. 442. Cenan- 

 gmmfuh'ginosum, Fr. El. \\.p. 23. Eng. Fl. v. p. 212. 



On willow branches. King's Cliffe. 



Not a good Filidium. 



Gen. 120. MELASMIA, Lev. 



Perithecium membranaceous, de- 

 hiscent above, rather swollen, at 

 length depressed and rugose, grow- 

 ing in a thin, spot-like, effused re- 

 ceptacle ; spores simple. — Berk.Outl. 



p.2> 



19. 



(Fig. 164.) 



Fig. 164. 

 1295. Melasmia alnea. Lev. " Alder Melasmia." 



Perithecia adnate, scattered, membranaceous, hemispherical, 

 even, black, at length flattened and rugulose ; spores elliptic- 

 elongated, obtuse, straight or curved. — Ann.Sc.Nat.l^4:^,VK. 

 p. 253. Grev.t.UQ,f.2. Fr. S.M.ii.p.b^^. 

 On living alder leaves. 



This plant presents exactly the aspect of Discosia alnea, but differs in the 

 spores. (Fig. 164.) 



Melasmia acerina, Lev. is a condition of Rkytisma acerinum. 

 Gen. 121. PIGGOTIA, B. & Br. 



Perithecium irregular, very thin, obsolete 

 below, forming by confluence a wrinkled 

 mass, bursting by a lacerated fissure ; spores 

 rather large, obovate, at length tomiparous. 

 ^Berk. Outl. p. 319. {Fig. 1G5.) 



