No. 5.] USTILAGINE.E OF CONNECTICUT. 39 



lowish or eventually reddish brown subcircular spots, which 

 sometimes merge into indefinite areas. The spore balls are 

 situated in the spongy parenchyma of the leaf, and consist of 

 a distinct cortex surrounding a single layer of fertile cells 

 within which is a central mass of sterile cells ; they are chiefly 

 subspherical or spherical, and 100-160^ in diameter. The 

 cortical cells are brown and small. The spores are slightly 

 yellowish tinted, chiefly polyhedral or slightly elongated ra- 

 dially, and S-12/j. in length. 



Host and Distr. : Potamogeton sps., Norwich (Setchell) ; 

 New Haven (Setchell) ; Simsbury (Setchell) ; Whitney ville, 

 Aug. 18, Sept. 2i, 1902; Westville, Sept. 8, 1904. 



Doassansia deformans Setch. The sori occur in various 

 parts of the host, usually in the leaves, where they form con- 

 spicuous distortions in the midribs and petioles. The spore 

 balls occur in the intercellular spaces, and consist of a cortical 

 layer surrounding a single layer of fertile cells within which 

 is a central mass of sterile cells ; they are chiefly subspherical, 

 and vary from 100-140/u in diameter. The cortical cells are 

 polyhedral, occasionally slightly elongated tangentially, small, 

 about 4-6^ by 8-12/z. The spores are ovoid to polyhedral, 

 rather firmly united, and chiefly 8-12/x, rarely 15/i, in length. 



Host and Distr.: Sagittaria variabilis, Norwich, Aug. 17, 

 1889 (Setchell) ; New Haven (Setchell). 



This species was originally described by Setchell from 

 Connecticut material. 



Doassansia obscura Setch. The sori are obscured, the 

 spore balls being hidden in the interior of the basal parts of 

 the petioles without especial discoloration or distortion. The 

 spore balls are arranged in a single row in the air chambers 

 of the host, and consist of a distinct cortex surrounding several 

 irregular layers of spores and a central mass of indefinite fun- 

 gal hyphse; they are oblong to subspherical, and of very large 

 size, 150-300/i in length. The conspicuous cortical cells are 

 light brown, ovoid to obovate or subcordate, and 12-18/i by 

 8-i2^u. The spores are chiefly subspherical and small, 8-12/j. 

 in diameter. 



Host and Distr. : Sagittaria variabilis, Norwich, Sept. 

 (Setchell). 



