804 



SPH^RIACEI. 



2411. Poly stigma fulvum. B.C. " Tawny Polystigma." 



Hypophyllous, somewhat angular, tawny ; cells immersed, of 

 the same colour ; ostiola immersed ; spermatia and sporidia ? — 

 DeCand. Mem. Mus.t. 6,/. 8. Tul. Carp.ii.p. 79. Fckl. Sym. 

 Mijc.p. 222. Dothidea fulva, Fr. S.M. ii. p. 554. Fries exs.no. 

 241. Eng. Fl. v.p.286. 3Ioug.exs.no. 271. Fckl. exs. no. 1S26. 



On living leaves of Prunus padus. Scotland. 



Gen. 348. 



OMR 



Fig. 384. 



DOTHIDEA, Fr. 



Perithecia none. Nucleus con- 

 tained in globose cavities immersed 

 in the stroma, with a decided neck, 

 and papill^form ostiolum. Sporidia 

 simple or septate. — F7\ S.M. ii.p, 

 548. Tul. Carp.u. p.66. 



(Fig. 384.) 



Section 1. Foliicolse. 

 Section 2. Caulicolse. 

 Section 3. Lichenicolee. 



Sect. 1. FoliicolcB. 



2412. 



Dothidea ulmi. Fr. " Elm-leaf Dothidea." 



Spermogonia. — According to some 2ivMhors=Septoria Ulmi, 

 Fr. (See no. 1297, ante.) 



Pycnidia. — Forming small, irregularly, stellate, aggregate 

 tubercles ; stylospores broadly ovate, on short sporophores, tomi- 

 parous. — Piggotia astroidea, B. ^ Br. Ann. N.H. no. 503. (See no. 

 1296, ante.) 



AscoPHORE. — Epiphyllous, roundish, confluent, convex, grey- 

 ish-black, black within ; cells white ; ostiola granulseform ; asci 

 cylindrical, stipitate ; sporidia simple, ovate-oblong, hyaline. — 

 Fr.S.M.n.p. 555. Eng.Fl.Y.p. 286. Grev.t. 200,/ 1. FckL 

 exs.no. 1013. Cooke exs. no. 184. Berk. exs. no. 192. Soiv. t. 

 374,/. 3. Phjllachora ulmi^ Fckl. Sym. Myc.p. 218. 



On elm leaves. Common. 



The asci are not matured until spring, after the leaves have laid upon the 

 ground through the winter. 



