158 
MILDEWS, RUSTS AND SMUTS 
Uredospores. Sori on both surfaces of the leaves, most 
abundant on the under side, on irregularly shaped yellowish 
spots, scattered, oblong or narrow, cinnamon ; spores 
subglobose, minutely echinulate, pale yellow, 19—27 p 
diam. 
Teleutospores. Sori on the upper surface of the leaves, 
scattered, or sometimes in clusters, oblong or often narrow, 
covered by the lead-coloured epidermis, blackish ; spores 
cylindric-clavate, tip generally truncate, rarely rounded 
or somewhat narrowed, thickened, slightly or not at all 
constricted at the septum, base narrowed, smooth, pale 
brown, tip darker, 40—80 x ii—22 p, pedicel short, almost 
colourless. 
Syn. Aecidium ranunculacearum, D.C., var. clematidis, 
D.C. ; Plowr., Ured., p. 265. 
Aecidium clematidis, Schwein. 
The aecidia occur on Clematis vitalha, also on several 
other species of Clematis. 
Uredospores and teleutospores on Triticum {Agropy- 
rum) glaucum, and T. junceum. 
Britain, Europe, Turkestan, Japan, N. and S. America. 
Puccinia persistens, Plowr., Ured., p. 180. 
Pycnidia. Arranged in minute clusters, orange. 
A ecidia. On the under surface of the leaves, spots purple- 
brown on the upper surface, yellow with a brownish border 
on the under surface, cup-shaped or more or less cylindrical, 
yellow, edge white, torn ; spores angularly globose or ellip¬ 
tical, minutely warted, orange, 14—28 p diam. 
Uredospores. Sori minute, circular or elongated, on yel¬ 
lowish spots, orange ; spores subglobose, minutely echinu¬ 
late, yellow, 25—30 p diam. 
Teleutospores. Sori minute, ovate, oblong or narrow, 
for a long time covered by the epidermis ; spores cylin¬ 
drical or club-shaped, tip truncate, rounded or obliquely 
narrowed, slightly thickened, more or less constricted at 
the septum, base narrowed, smooth, brown, 50—60 x 
15—20 p, pedicel short, persistent, colourless. 
Syn. Aecidium ranunculacearum, D.C., var. thalictri, 
Cooke. 
Aecidium thalictri, Grev. 
The aecidium stage occurs on the leaves of Thalictrum 
flavum, T. minus, and on other species of Thalictrum. 
Uredospores and teleutospores on Triticum repens, and 
perhaps on Arrhenatherum elatior {=Avena elatior). 
