OX GRAMINE.K 



273 



It was Plowright who first proved, by a long series of cultures, that 

 the secidium of this species is produced only on the two species of 

 Ranunculus given above; Klebahn and Fischer have since abundantly 

 confirmed his results. The secidia belonging to Uromyces Poae and 

 O. Dactylvdis occur on the same hosts and are morphologically quite 

 indistinguishable, but begin to appear earlier in the spring. 



P. Magnusiana is distinguished from the two following species by its 

 numerous small teleuto-sori, and the abundant paraphyses mixed with 

 its uredospores; the teleutospores also show hardly any constriction. 

 McAlpine describes mesospores 28 — 38 x 13— 19/*, and says that the apex 

 of the paraphyses in the Australian specimens is of a dark smoky-brown. 

 This species and P. Phragmitis may occur together upon the same leaf. 



Distribution : Europe, South Africa, Japan, Australia. 



127. Puccinia Phragmitis Korn. 



JEcidium rubellum Gmel. Syst. Nat. ii. 1473. Cooke, Handb. p. 544 ; 



Mier. Fung. p. 199 p.p. Purton, Midi. Flor. iii. 294, pi. 26. 

 Uredo Phragmitis Schum. Fl. Sail. ii. 231. 

 Puccinia arundinacea Hedw. in DC. Flor. fr. v. 59. Cooke, Handb, 



p. 493; Micr. Fung. p. 202. 

 P. Phragmitis Korn. in Hedwig. 1876, p. 179. Plowr. Ured. p. 175. 



Sacc. Syll. vii. 630. Sydow, Monogr. i. 787. Fischer, Ured. 



Schweiz, p. 250, f. 192. 



Spermogones. Whitish. 



jEcidiospores. iEcidia hypo- 

 phyllous, on circular red or deep 

 purple spots ^ — 1^ cm. diam., in 

 dense clusters, shortly cylindrical or 

 cup-shaped, with a cut white re- 

 curved margin ; spores verruculose, 

 nearly hyaline, 16 — 26 /x; spore- 

 mass white. 



Uredospores. Sori amphige- 

 nous, scattered or subgregarious, 

 elliptical, lanceolate or linear, some- 

 times confluent, rather large, con- 

 vex, pulverulent, brown, without 

 paraphyses ; spores subglobose or 

 obovate, verruculose rather than 



Fig. 208. P. Phragmitis. Teleu- 

 tospores and uredospore ; a,. 

 sori on leaf of Pliragmites. 



G. U. 



18 



