ON GRAMINEE 273 
It was Plowright who first proved, by a long series of cultures, that 
the ecidium of this species is produced only on the two species of 
Ravunculus given above; Klebahn and Fischer have since abundantly 
confirmed his results. The ecidia belonging to Uromyces Poae and 
U. Dactylidis occur on the same hosts and are morphologically quite 
indistinguishable, but begin to appear earlier in the spring. 
P. Mugnusiana 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 yu, 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 leat. 
DistRisuTion: Europe, South Africa, Japan, Australia. 
127. Puccinia Phragmitis Korn. 
Evidium rubellum Gmel. Syst. Nat. ii. 1473. Cooke, Handb. p, 544 ; 
Micr. Fung. p. 199 p.p. Purton, Midl. Flor. iii. 294, pl. 26. 
Uredo Phragmitis Schum. FI. Sall. ii. 231. 
Pucetnia 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. 
Aeidivspores. Aicidia hypo- 
phyllous, on circular red or deep J 
purple spots 4—I}cm. diam., in 
dense clusters, shortly cylindrical or 
cup-shaped, with a cut white re- 
curved margin; spores verruculose, 
nearly hyaline, 16—26»; spore- 
mass white. 
Uredospores. Sori amphige- 
nous, scattered or subgregarious, 
elliptical, lanceolate or linear, some- 
times confluent, rather large, con- 
vex, pulverulent, brown, without _ 
Fig. 208. P. Phragmitis. Teleu- 
paraphyses ; spores subglobose OF tospores and uredospore; u, 
obovate, verruculose rather than  %ori on leaf of Phragmites. 
G U. 18 
