38 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 
A. Sori in the slightly swollen ovaries..... D. occulta, 
B. Sori forming discolored areas in leaves.......... 
D. Martianoffiiana, 
C. Sori forming conspicuous distortions usually in 
. TES snkiecovied saeaecoroeuas D. deformans. 
III. Spore balls with several irregular layers of spores, within 
which are hyphal threads; sori indefinite, hidden in 
leat petiOlesincrc.cci.ieiccvava acisiew xigitne nein D. obscura. 
Doassansia opaca Setch. Figs. 19, 22, 29. The sori 
form in the leaves evident lead-colored pustules, about 2-5 
mm., which show as slight elevations on both surfaces; they 
are more or less scattered, usually in yellowish or reddish 
brown widely discolored areas. The spore balls are closely 
compacted in a single layer, occupying most of the space be- 
tween the epidermal layers of the leaf, and consist of a distinct 
cortex with a mass of fertile cells entirely filling the interior; 
they are oblong to subspherical or cuboidal, and 200-300n in 
greatest length. The cortical cells are reddish brown, oblong 
or subcubical, prominent, about 14-27p in length. The spores 
are rather loosely compacted, chiefly subspherical, 10-15 in 
diameter. 
Host and Distr.: Sagittaria variabilis, Norwich, Aug. 14, 
1889 (Setchell) ; New Haven (Setchell) ; Whitneyville, Aug. 
10, 1902; Montowese, Sept. 20, 1902; Westville, Sept. 8, 1904. 
A portion of one of the spore balls is shown in cross section 
in Fig. 19. 
Doassansia occulta (Hoffm.) Cornu. The sori occur in 
the ovaries, forming swollen, ovate bodies. The spore balls 
consist of a distinct cortex within which is a single layer of 
fertile cells surrounding a central mass of parenchymatous tis- 
sue; they are subspherical or more irregular, and 100-160p in 
length. The cortical cells are polyhedral or more elongated 
tangentially, and 8-10u in length. The spores adhere rather 
firmly, and are about 10-12 in length. 
Host and Distr.: Potamogeton Pennsylvanicus, Norwich, 
Aug. 26, 1889 (Setchell) ; Bridgeport (Morong). 
Doassansia Martianoffiana (Thiim.) Schrét. In this 
species the sori occur in the leaves, forming unthickened, yel- 
