38 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



A. Sori in the slightly swollen ovaries D. occulta. 



B. Sori forming discolored areas in leaves 



D. MartianoMana. 



C. Sori forming conspicuous distortions usually in 



leaves D. deformans. 



III. Spore balls with several irregular layers of spores, within 

 which are hyphal threads ; sori indefinite, hidden in 

 leaf petioles D. obscura. 



Doassansia opaca Setch. Figs. 19, 22, 29. The sori 

 form in the leaves evident lead-colored pustules, about 2-5 

 mm., which show as slight elevations on both surfaces; they 

 are more or less scattered, usually in yellowish or reddish 

 brown widely discolored areas. The spore balls are closely 

 compacted in a single layer, occupying most of the space be- 

 tween the epidermal layers of the leaf, and consist of a distinct 

 cortex with a mass of fertile cells entirely filling the interior; 

 they are oblong to subspherical or cuboidal, and 200-300/i in 

 greatest length. The cortical cells are reddish brown, oblong 

 or subcubical, prominent, about 14-27/u in length. The spores 

 are rather loosely compacted, chiefly subspherical, 10-15^ in 

 diameter. 



Host and Distr. : Sagittaria variabilis, Norwich, Aug. 14, 

 1889 (Setchell); New Haven (Setchell) ; Whitneyville, Aug. 

 10, 1902 ; Montowese, Sept. 20, 1902 ; Westville, Sept. 8, 1904. 



A portion of one of the spore balls is shown in cross section 

 in Fig. 19. 



Doassansia occulta (Hoffm.) Cornu. The sori occur in 

 the ovaries, forming swollen, ovate bodies. The spore balls 

 consist of a distinct cortex within which is a single layer of 

 fertile cells surrounding a central mass of parenchymatous tis- 

 sue; they are subspherical or more irregular, and 100-160^ in 

 length. The cortical cells are polyhedral or more elongated 

 tangentially, and 8-10^ in length. The spores adhere rather 

 firmly, and are about 10-12^ in length. 



Host and Distr. : Potamogeton Pennsylvanicus, Norwich, 

 Aug. 26, 1889 (Setchell); Bridgeport (Morong). 



Doassansia Martianoffiana (Thiim.) Schrot. In this 

 species the sori occur in the leaves, forming unthickened, yel- 



