482 'PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Doassansia Martianoffiana Schrot., Krypt. FI. Schles., 31 : 287. 1887. p. p. 
Doassansiopsis Martianoffiana Diet., Nat. Pflanzenf., 1 1 * * : 21. 1897. 
Exsiccati: Doassansia Martianoffiana (Thtim.), on Potamogeton sp., Ell. 
& Ev., N. A. Fungi, 3239, Ell. & Ev., Fungi Col., 863, Seym. & Earle, Econ. 
Fungi Clinton Lst. Supp., C 9, C 10; on Potamogeton natans, Seym. & 
Earle, Econ. Fungi Clinton Ust. Supp., C 11. 
Sori in leaves, thin, forming at first yellowish but eventually red¬ 
dish brown discolorations, distinct as small circular spots or more 
usually merged into indefinite areas often covering greater surface 
of leaf; spore balls situated in the spongy parenchyma, consisting 
of a distinct cortex surrounding a single layer of fertile cells within 
v hich is a central mass of parenchymatous cells, subspherical or 
spherical, 100—160 p in diameter; cortical cells brown, small; spores 
slightly tinted, chiefly polyhedral or slightly elongated radially, 8- 
12 p in length. 
Hosts: Potamogeton riatans , Mass. ; P otamogeton sp., Conn., 
Ill., N. Y., Wise., Can. 
4 his fungus is closely related to Poassansia occulta occurring in 
the ovaries of similar hosts. The spores apparently germinate in 
the host, giving rise to a sort of conidial growth. Literature : 48, 
160, 161. 
Doassansia intermedia Setch. 
Doassansia intermedia Setch., Bot. Gaz., 19 : 185-186. 1894. 
Doassansia affinis Ell. & Dearn., Bull. Torr. Bot. Club, 22 : 364. 1895. 
Exsiccati: Doassansia affinis Ell. & Dearn., on Sagittaria variabilis 1 Ell. 
& Ev., N. A. Fungi, 3341, Ell. & Ev., Fungi Col., 862, 
Soii in leaves, forming light yellow to brownish subcircular spots, 
^~I2 mm. in diameter, with spore balls showing as minute hypophyl- 
lous pustules, spore balls situated in spongy parenchyma, consisting 
of a cortex surrounding several layers of spores and a central mass 
of parenchymatous cells, ellipsoidal to spherical, 200-300 p in length; 
cortical cells with dark brown moderately thick walls, chiefly sub- 
spherical, cubical, or polyhedral, occasionally more elongated of 
medium size, 9-14 p in length; parenchymatous cells thin walled, 
empty, about the size of the spores or slightly larger; spores adher¬ 
ing rather firmly, ellipsoidal to chiefly spherical, chiefly 8-11 p in 
length. 
