MILDEWS, RUSTS AND SMUTS 
201 
surface of the leaves, ratlier large, more or less circular, 
often encroaching on each other, on pale yellow spots ; 
spores irregularly globose, wall thickish, 9-—14 [jl ; promy¬ 
celium spores similar to those of D. alismaiis. 
Syn. Uredo sagittariae, West. 
Physoderma sagittariae, Fuckel. 
Protomyces sagittariae, Fuckel. 
Protomyces hizzozeriamis, Sacc. 
On leaves of Sagittaria sagittifolia. 
France, Germany, Italy, Belgium, N. and S. America. 
Doassansia comari, De Toni and Mass. 
Sori gregarious or scattered, blackish when dry, rather 
small; spores broadly elliptical, smooth, pale brown with 
a violet tinge, 10 x 7 p, general receptacle enclosing the 
spore-mass well developed, brown. 
Syn. Protomyces comari. Berk. 
On leaves of Comarum palustre. 
Forming gregarious or scattered, usually elongated, 
pustules on both surfaces of the leaves. 
TUBURCINIA, Fries. 
Sori flattened or slightly swollen, black, often large ; 
spores aggregated in clusters ; germination by the protru¬ 
sion of a slender promycelium producing promycelium 
spores as in Entyloma. Conidiophore stage forming ex¬ 
panded white tufts on the leaves. 
Resembling Sorosporium in having the spores in dense 
clusters, differing in the absence of a gelatinous investment 
surrounding the spore-masses. 
Tuburcinia trientalis, Berk, and Broome ; Plowr., Ured,, 
p. 293. 
Spore-masses forming black, swollen spots on the stem 
and leaves ; spore-clusters irregular in form, containing 
from 50—100 spores ; spores globose or elliptical or more 
or less flattened from mutual pressure, 15—32 X 10-—17 p, 
wall smooth, dusky brown ; promycelium spores numerous, 
produced at the tip of the promycelium, cylindric spindle- 
shaped, conjugating near the base, and afterwards producing 
secondary spores ; conidia elliptical or more or less pear- 
shaped, colourless, 
Syn. Ascomyces trientalis. Berk. 
Sorosporium trientalis, Wor. 
On Trientalis europaea, Paris quadrifolia. 
Forming crust-like expansions on the stem, and rounded 
