■274 I'l (CINIA 



echinulate, brownishj 25 35 x 16— 2(i /u,: contents colourless; 

 epispore rather thick, with four i-qnaturial germ -pores. 



Ti'I('ii(i>sj)ares. Sori numerous, similar, bul larger and 

 thicker, very convex and compact, black : spores oblong, rounded 

 ,-it both ends, thickened (4 — 9/a) above, constricted, smooth, 

 ( |. -i| ) vclluw ish-brown, 45 — 65x16 — 25 /u, sometimes 75 /j, lung; 

 pedicels hyaline or yellowish, thick, persistent, 100 — 200 /x long. 



.Kcidia on Rumex acutus, R. crispus, R. conglomeratus, 

 R. Hydrolapathum, Ji. obtusifolins. Rheum officinale, -May ami 

 .lane: uredo- and tclcutospores on Phragmites communis. 

 July — May, often in the same sori. Xot comniun, except 

 locally. (Fig. 208.) 



It was Plowright who first showed that P. Phragmitis has its secidium, 

 not on Ranunculus, but on species of Rumex and lllo-um (not, however, 

 on Rumex Acetosa). Klebahn and Fischer have confirmed his results, 

 and Arthur lias done the same for the Xorth-American forms. It is a 

 remarkable fact, however, that the reeidium had not been previously 

 found in North America until Arthur obtained it artificially by infection 

 of Rumex crispus and R. obtusifolius with the teleutospores of P. Phrag- 

 mitis. Afterwards it was found in Nebraska on various species of Rumex 

 and Rheum. It is suggested by Sydow that this species is dispensing 

 with the seeidium, in which case it must winter by means of its uredo- 

 s] lores. Even in England the secidium 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. 



Mcidium rubellum Gmel. ; Cooke, Handb. p. .">44 ; Micr. Fung, 

 p. 199 p.p. 

 • Puccini" Trailii Plowr. Ured. p. 176. Sacc. Syll. ix. 312. Sydow, 

 Monogr. i. 790. Fischer, Ured. Schweiz, p. -I'rl, f. 193. 



jEcidiospores. Similar to those of the last species ; but the 

 spots are purple, surrounded by a yellow margin, the a?cidia are 

 wider and flatter, and the spores are on the average somewhat 

 larger. 



Uredospores. Sori amphigenous, scattered, rather large, 



