176 
Davis—Parasitic Fungi of Wisconsin . 
spore and bears upon its tip three, rarely two 
or four, sporidia. In the simplest type a pro¬ 
tuberance appears on the sporidium at a point, 
above its middle which develops into a branch 
equal to the sporidium above the point of branch¬ 
ing. The sporidium then becomes detached form¬ 
ing a free body consisting of three arms radiat¬ 
ing from a center. If the germination is a little 
more vigorous two branches are formed, which, 
together with the sporidium above their point of 
attachment, form the triradiate body. When the 
germination is very vigorous branchlets form on 
the branches and these in turn may develop 
branches until a tree-like growth is produced. 
The detached sporidia, however, are always tri¬ 
radiate and remind one of the spicules of sponges. 
I have seen no further development and no con¬ 
jugation. The absence of septa in the promy¬ 
celium and especially of the septate bodies de¬ 
scribed and figured by Cunningham, intermediate 
between the promycelium and the sporidia, make 
it certain either that the germination phenomena 
are widely variable or that the American form is 
specifcally distinct. I have therefor made use of 
the only name that has been distinctively applied 
to the American plant. 
561. Doassansia deformans, Setchell. 
On Sagittaria variabilis , Engelm., Racine. 
562. Doassansia martianoffiana, (Thum.) Schrt. 
On Potamogeton sp. Racine and Forest county. 
563. Doassansia obscura, Setchell. 
On Sagittaria variabilis , Engelm., Racine. 
564. Doassansia ranunculina, Davis. 
On Ranunculus multifidus , Pursh., Racine. 
565. Doassansia sagittaria, (Westd.) Fisch. 
On Sagittaria variabilis , Engelm., Racine. 
566. Burrillia globulifera, Davis. 
On Glyceria fluitans , R. Br., Sauk City. 
(Lueders). Racine. 
