156 
MILDEWS, RUSTS AND SMUTS 
Puccinia phragmitis, Koern. ; Plowr., Ured., p. 175. 
Aecidia. On the under surface of the leaves, on large 
brownish or purplish spots, shortly cylindrical cup-shaped, 
edge white, recurved, torn ; spores angularly globose, 
minutely warted, almost colourless, 16—26 p diam. 
Uredospores. Sori on both surfaces of the leaves, scat¬ 
tered or somewhat clustered, elliptical or narrow and elon¬ 
gated, rather large, convex, powdery, brown, no para- 
physes present ; spores subglobose, ovate or elliptical, 
minutely warted or echinulate, brownish, 25—35 X 16— 
20 p,, epispore thickish, with four germ-pores arranged 
equatorially. 
Teleutospores. Sori on both surfaces of the leaves, scat¬ 
tered or in clusters, elliptic, oblong or narrow, often growing 
into each other,, large, convex, thick, dusky brown ; spores 
oblong, somewhat rounded at the ends, tip thickened, 
constricted at the septum, smooth, deep yellowish-brown, 
45—65 X 16—^25 p, rarely up to 75 p in length, pedicel 
tinged yellow, stout, persistent, 100—200 p long. 
S3m. Puccinia arundinacea, D.C. 
Aecidium rubellum, Gmel. 
Caeoma rumicis, Schlecht. 
The aecidia occur on living leaves of Rumex aquaticus, 
R. conglomeratus, R. crispus, R. hydrolapathum, R. mari- 
timum, R. obtusifolium, and on rhubarb— Rheum officinale. 
Teleutospores and uredospores on Phragmites communis, 
and perhaps on Arundo donax. 
Britain, Europe, S. Africa, Japan, N. and S. America. 
Puccinia trailii, Plowr., Ured., p. 175. 
A ecidia. On the under surface of the leaf, on more or less 
circular, brownish or brownish-purple spots, cup-shaped, 
edge recurved, white, torn ; spores angularly globose, 
minutely warted, colourless, 16—27 p diam. 
Uredospores. Sori on both surfaces of the leaves, scat¬ 
tered, rather large, elliptical or narrow, reddish-brown, 
powdery ; paraphyses absent ; spores subglobose, ovate or 
elliptical, pale brown, 25—35 x 20—25 p. 
Teleutospores. Sori on both surfaces of the leaf, scattered, 
often running into each other, compact, convex, blackish ; 
spores oblong, ends somewhat rounded, thickened, con¬ 
stricted at the septum, brown, very minutely granulated, 
50—60 X 20—23 p, pedicel stout, firm, tinged brown, 
75—100 p long. 
Syn. Aecidium rubellum, Gmel. (in part). 
