578 



DEMATIEI. 



On fading leaves of Sagittaria sagittifolia. Sept. Irstead, 



Norfolk. 13ungay, bufifolk. 



On both surfaces of the leaves ; spots scattered, tawny, irregular, some- 

 times confluent ; flocci of two kinds, one conidiiferous, short, nodulose, 

 tawny ; the other simple, elongated, subflexuose, hyaline, obtuse above, and 

 attenuated below. 



Gen. 213. laYSTROSPORIUM, Corda. 



Flocci erect or ascending, quite 

 simple, septate, torulose, opaque, 

 bearing a solitary spore at the 

 apex ; spores multicellular. — 

 Corda. Ic. ii. p. 13. 



(Fig. 248.) 



Fig. 248. 



1735. 



IVIystxosporiuxn. stemphyliuxn. Corda. ** Obovate 

 Mystrosporium." 



Tufts broadly effused, black ; flocci short, flexuous, erect, 

 olive-brown ; spores obovate, polymorphous, unequal, multicel- 

 lular, brown, yellow, or olive; peduncular appendage paler. — 

 CorJa. ii./. 61. B.^Br.Ann.N.H.no.U^. Pay.f.^24.. 



On dead wood. Bury St. Edmunds. {Fig- 248.) 



Spores '0015 in. diameter. 



Gen. 214. 



ACROTHECIUIYI, Corda. 



Flocci creeping or erect, septate, 

 simple or branched, branches ascend- 

 ing ; spores clustered at the apex, or 

 solitary at the tips of the branches ; 

 septate. — Corda. Ic. li.p. 10. 



The typical species of Corda has the flocci 

 creeping, and branched, the spores solitary 

 and fusiform. The generic character has 

 been extended, so as to include A. multi- 

 sporum, Preuss, and the British species, 

 which could hardly have been retained under 

 the original characters. (Fiff. 249.) 



Fig. 249 



