704 Wisconsin Academy of Sciences, Arts, and Letters. 
I am not able to distinguish it from forms on Sagittaria latifolia, 
S. arifolia and S. sagittifolia with crowded and distorted sori. 
In the summer of 1916 collections were made of what proved to 
be a quite different type on Sagittaria keterophylla. 
Doassansia (doassansiopsis) furva n. sp. 
Spore balls in the leaf blades, loosely clustered, discrete, 
brown-black, spherical to oval, 100-150/* long; spores in a single 
layer surrounding the sterile parenchymatous central portion, 
rounded-cuboidal, 8-10 /a long; cortical cells inconspicuous, 
plano-convex to flattened, 6-9/* wide by 1-3/a high. In leaves 
of Sagittaria heterophylla. Arcadia, Wisconsin, July 31st and 
August 2nd, 1916. This differs from Doassansia martianoffiana 
(Thuem.) Schroet. in the darker color, habitat and probably in 
the absence of conidia; from D. deformans Setch. in the much 
darker sori, part of the host attacked and in not causing hyper¬ 
trophy. In color and to some extent in structure it recalls 
Doassansia zizaniae Davis (Bot. Gaz. 26:353) which was re¬ 
ferred to Sclerotium in the provisional list and suggests that 
that is also a member of this group. 
UNIVERSITY OF WISCONSIN HERBARIUM, 
MADISON, WISCONSIN, APRIL, 1917. 
