12 
MILDEWS, RUSTS AND SMUTS 
May possibly prove to be a form of C. tragopogonis, 
Cystopus portulacae, Lev. Sori white or slightly tinged 
yellow, form and size variable, rounded or wavy, irregularly 
scattered; sporophores somewhat club-shaped; conidia 
of two forms, the terminal one larger than the rest, wall 
thick, yellowish, base often depressed or umbilicate, sterile 
or producing mycelium on germination, 20—22 (jl diam., 
the remainder broadly cylindrical, or somewhat variable 
in shape, colourless, 14—17 X 12—14 p, producing lenti¬ 
cular zoospores on germination ; oospores globose, wall 
regularly netted, usually with a wart in the centre of each 
mesh, yellow or yellowish brown, 45—60 p, diam. 
Parasitic on the leaves of Portulaca oleracea and P. 
sativa. 
Cystopus lepigoni, De Bary. Sori usually in small, 
scattered patches, yellowish ; conidia of two kinds, the 
terminal one larger than the remainder, globose, thick 
walled, colourless or tinged brown, sterile, 27—30 p diam., 
the remainder globose or broadly elliptical, wall thin, colour¬ 
less, 18—25 X 18 — 20 p, producing zoospores on germina¬ 
tion ; oospore globose, wall brown or yellowish-brown, 
densely covered with minute warts, which sometimes be¬ 
come spinulose, 50—65 p diam. 
Parasitic on Spergularia rubra, Arenaria media, and other 
caryophyllaceous plants. 
Cystopus bliti, De Bary. Sori variable in size, gregari¬ 
ous, swollen, yellowish white; conidiophores somewhat 
club-shaped; conidia of two shapes, the terminal one 
globose, with a thick wall, the remainder obovate, apex 
broadly rounded, base truncate, the wall with a thickened 
ring at the central part, 15—20 x 14—18 p ; oospore 
globose, wall netted, the ridges forming pentagons or hexa¬ 
gons, 55—65 p diam. 
Syn. Cystopus amaranthi, Schwein. 
Cystopus amaranthacearum, Zal. 
Parasitic on stems and leaves of various species of 
Amaranthus, Cyatula and Achnida. 
Cystopus tragopogonis, Schroet. Sori variable in size, 
irregularly globose or oblong, compressed, white, or some¬ 
times with a tinge of yellow, becoming powdery ; conidia 
of two different shapes, the terminal one much larger than 
the rest, depressed globose and usually indented or un- 
bilicate at the base, wall thick, colourless or tinged yellow, 
