ii8 
MILDEWS, RUSTS AND SMUTS 
APIUM 
Puccinia apii, Desm.; Plowr., Ured., p. 156. 
Aecidia. On circular yellow spots on the under surface 
of the leaves, often elongated on the stem and leafstalks, 
very shortly cylindrical, edge white, torn ; spores sub- 
globose, minutely warted, orange, 17—25 p diam. 
Uredospores. Sori scattered, or here and there clustered, 
powdery, cinnamon-brown, on the under surface of the leaf ; 
subglobose or elliptical, echinulate, tip slightly thickened, 
yellowish-brown, 24—35 x 20—26 p, with three germ- 
spores. 
Teleutospores. Sori mostly on the upper surface of the 
leaf, or on the leafstalks, scattered, or here and there in 
groups, powdery, dusky-brown ; spores oblong or ovate- 
oblong, tip rounded, not thickened, slightly or not at all 
constricted at the septum, base rounded or slightly 
narrowed, smooth, brown, 30—50 x 18—25 p, pedicel 
slender, colourless, deciduous. 
On apium graveolens. Britain, Europe generally, India, 
Japan, and Tasmania. 
BUNIUM 
Puccinia bulbocastani, Fuckel. 
Aecidia. Occuring on the leaves, leafstalks and stem, 
frequently causing very marked distortions on the latter, 
cup-shaped or shortly cylindrical, edge white and irregu¬ 
larly torn ; spores angularly globose, very minutely warted, 
yellow, 15—22 p diam. 
Teleuto spores. Sori minute, circular, scattered, sometimes 
elongated on the leafstalks, for a long time covered by the 
epidermis, blackish ; spores elliptical, or elliptic-oblong or 
ovate-oblong, tip rounded, not thickened, scarcely, or not 
at all constricted at the septum, base rounded or narrowed, 
with a very delicate network on the epispore, brown, 
28—50 X 15—25 p, pedicel slender, colourless, deciduous. 
Syn. Puccinia hunii, Winter; Plowr., Ured., p. 206. 
Aecidium hunii, D.C.; Plowr., Ured., p. 270. 
On Bunium flexuosum (=Conopodium denudatum, Bul- 
hocastanum). Britain, Europe generally, Algeria. 
Puccinia tumida, Grev. 
Teleuto spores. Sori minute, but crowded into thickened 
crusts, for a long time covered by the epidermis, on the leaves 
and leafstalks, blackish or blackish-brown ; spores ellip¬ 
tical or ovate-elliptical, tip rounded, not thickened, not 
