274 PUCCINIA 
echinulate, brownish, 25—35 x 16—26 ; contents colourless ; 
epispore rather thick, with four equatorial germ-pores. 
Teleutospores. Sori numerous, similar, but larger and 
thicker, very convex and compact, black ; spores oblong, rounded 
at both ends, thickened (4—9 yu) above, constricted, smooth, 
deep yellowish-brown, 45—65 x 16-—25 u, sometimes 75 uw long; 
pedicels hyaline or yellowish, thick, persistent, 100—200 p long. 
AKcidia on Rumex acutus, R. crispus, R. conglomeratus, 
R. Hydrolapathum, R. obtusifolius, Rheum officinale, May and 
June; uredo- and teleutospores on Phragmites communis, 
July—May, often in the same sori. Not common, except 
locally. (Fig. 208.) 
It was Plowright who first showed that P. Phragmitis has its ecidium, 
not on Ranunculus, but on species of Rumex and Rheum (not, however, 
on Rumex Acetosa). Klebahn and Fischer have confirmed his results, 
and Arthur has done the same for the North-American forms. It is a 
remarkable fact, however, that the scidium had not been previously 
found in North America until Arthur obtained it artificially by infection 
of Rumex crispus and R. obtustfolius with the teleutospores of P. Phrag- 
mitis, Afterwards it was found in Nebraska on various species of Rumezx 
and Rheum. It is suggested by Sydow that this species is dispensing 
with the ecidium, in which case it must winter by means of its uredo- 
spores. Even in England the e«cidium seems relatively scarce, but it is 
very conspicuous, and can be found on Rumex growing amidst Reeds. 
DISTRIBUTION: Europe, South Africa, Japan, North America, 
Chili. 
128. Puccinia Trailii Plowr. 
Aicidium rubellum Gmel.; Cooke, Handb. p. 544; Micr. Fung. 
p. 199 p.p. 
Puceinia Traalii Plowr. Ured. p. 176. Sace. Syll. ix. 312. Sydow, 
Monogr. i. 790. Fischer, Ured. Schweiz, p. 252, f. 193. 
Ajcidiospores. Similar to those of the last species; but the 
spots are purple, surrounded by a yellow margin, the ecidia are 
wider and flatter, and the spores are on the average somewhat 
larger. 
Uredospores. Sori amphigenous, scattered, rather large, 
