40 CONNECTICUT GEOL. AND NAT. HIST. suRVEY. [Bull. 
Setchell described this species originally from Connecticut 
and Massachusetts. This is the only collection reported for 
this state; the fungus is so hidden in the host that it is not 
easily detected. 
Tracya Syd. 
The sori occur permanently embedded in the tissue of the 
leaves (fronds). The spore balls are destitute of a cortical 
layer, and consist of a single layer of spores enclosing a net- 
work of septate filaments. The spores are hyaline or yellow- 
ish, firmly united, and of small to medium size. Fig. 20. 
This genus, first described by Setchell under the name 
Cornuella, contains a single species, which has been reported 
only from North America and on a single species of duckweed. 
It is closely related to Doassansia, but lacks the sterile cortex. 
Tracya Lemnz (Setch) Syd. Fig. 20. The sori occur 
in the languishing fronds, showing the spore balls under a 
hand lens as minute, clustered or scattered, opaque embedded 
bodies. The spore balls are situated in the spongy paren- 
chyma above the lower epidermis, are subspherical and rather 
small, 50-100z in diameter. The spores are yellowish, firmly 
compacted, cuboidal, polyhedral or often more elongated ra- 
dially, and chiefly 10-12y in length; they arise from the ends 
of the sterile network of brownish hyphz that fill the interior. 
Host and Distr.: Spirodela . polyrrhiza, New Haven 
(Setchell) ; Whitneyville, Oct., 1902. 
This is one of the most interesting species of the Ustila- 
gine. So far it has been reported only from four states. As 
in Doassansia, sections of the infected tissue are necessary to 
make out the structure of the fungus. Fig. 20 shows merely 
a portion of the spore ball in cross section. 
LIST OF HOSTS, ACCORDING TO FAMILIES. 
MONOCOTYLS. 
NAIADACEZ. ALISMACER. 
Potamogeton Bednavivanicua: Sagittaria variabilis. 
Doassansia occulta. Doassansia deformans. 
Potamogeton ps. Doassansia obscura. 
Doassansia Martianoffiana. Doassansia opaca. 
