CLINTON: NORTH AMERICAN USTILAGINEAE. 
483 
Host: Sagittaria variabilis, la., Minn., N. H. (type)., Wise., 
Can. (type D. affinis). 
This species is intermediate between Durrillia pustulata and 
Doassansia Sagittariae , differing from the former by its distinct 
cortex and from the latter by the presence of the central parenchy¬ 
matous cells. The germination is not known. There has been 
another species described under the same name from France. If 
that is really distinct, the present fungus has prior claim to the name. 
Literature : 29, 43, 162. 
Doassansia deformans Setch. 
Doassansia deformans Setch., Proc. Amer. Acad. Arts Sci., 26 : 17. 1891. 
Doassansiopsis deformans Diet., Nat. Pflanzenf., I 1 **: 21. 1897. 
Exsiccati: Doassansia deformans Setch., on Sagittaria variabilis , Ell. 
& Ev., N. A. Fungi, 2705, Ell. & Ev., Fungi Col., 272, Rab.-Wint.-Paz., 
Fungi Eur., 4002, Seym. & Earle, Econ. Fungi Clinton Ust. Supp., C 8. 
Sori in various parts of the host, usually causing conspicuous dis¬ 
tortions when in the petioles or midribs, sometimes even 2-3 cm. 
in width by 7-8 cm. in length ; spore balls filling intercellular spaces, 
consisting of a cortical layer surrounding a single layer of fertile 
cells and a central mass of parenchymatous cells, spherical, 100-140 p 
in diameter; cortical cells polyhedral, occasionally slightly elongated 
tangentially, sometimes even triangular in cross section, small, 4-6 p 
x 8-12 p ; parenchymatous cells, thin walled, without contents, 
chiefly larger than the spores, sometimes even 22 p in length ; spores 
ovoid to polyhedral, rather firmly united, with rather thin smooth 
walls, 8-12 p, rarely 15 p, in length. 
Hosts: Sagittaria variabilis, Conn, (type), Ill., Mass., Mo., R. I., 
S. Dak., Wise., Can.; S. variabilis var. angustifolia , Ill.; Sagit¬ 
taria sps., Fla., Tex. 
This species is distinguished by the very evident distortions that 
it produces on various parts of the host. Sometimes, however, when 
the sori occur in the leaf blade the distortion is not very evident. 
The structure of the spore balls is very similar to that of Doassansia 
occulta. The germination of the spores is described by Setchell. 
Literature: 160,161. 
