Part 1, 1906] TIIvIvE^TlACEAE) 69 



3. Doassansia Sagittariae (Westend.) Fisch, Ber. Deuts. Bot. 



Ges. 2 : 405. 1884. 



Uredo Sagittariae Westend. Herb. Crypt. Beige 1177 1857 



Doassansta SagittaHae f. conjluens Davis, Trans. Wise. Acad. 14 : 92. 1903. 



Sori in leaves, thin, showing as distinct or somewhat merged yellowish or reddish- 

 brown areas in which the spore-balls form numerous very minute elevations ; spore-balls 

 situated in either palisade -layer or the spongy parenchyma, consisting of a distinct cortex 

 with spore-mass entirely filling the interior, subspherical, about 100-125 ^ in diameter ; 

 cortical cells light reddish-brown, ovate to subspherical or irregularly polyhedral, rather 

 thin-walled, loosely adhering, prominent, 10-18 fj. in length ; spores loosely compacted, 



chiefly subspherical or polyhedral, with moderately thick smooth wall, chiefly 8-13 // in 

 diameter. 



On Alismaceae : 



Sagiitaria arifolia, Illinois. 



Sagittaria graminea^ Delaware, Illinois. 



Sagiitaria latifolia {S. variabilis'), Kansas, Missouri, New York, Ohio, Wisconsin 



Sagittaria rigida (S. heterophylla)^ Wisconsin. 



Sagittaria sp., Missouri, Vermont ; Canada. 



Type locality : Marbais, Belgium, on Sagiitaria sagiiiifolia. 



Distribution : Vermont to Delaware, Wisconsin, and Kansas ; Canada ; also in South America 

 and BJurope. 



Illustrations : Ann. Bot. 6 : pi. 2,f.71 , Brefeld, Unters. Gesammt. Myk. 12 : pi. 12, /". 1-16 • 

 Ber. Deuts. Bot. Ges. 2 :;!>/. 76*. ^ >J 



ExsicCATi : Seym. & Earle, Econ. Fungi C 14, C 15 ; Rab.-Wint. Fungi Eur. 2902a. 



4. Doassansia Alismatis (Nees) Cornu, Ann. Sci. Nat. 



VI. 15: 285. 1883. 



Scleroiium Alismatis Nees ; Fries, Syst. Myc. 2 : 257. 1822. 



Entyloma A lismacearum Sacc. Michelia 2 : 44. 1880. (Type from France, on Alisma Flaniago.) 



Sori in leaves, thin, forming at first yellowish but eventually reddish-brown spots, sub- 

 circular or irregular, distinct (5-12 mm.) or irregularly confluent, with spore-balls show- 

 ing as very minute chiefly epiphyllous elevations ; spore-balls situated in both palisade- 

 layer and spongy parenchyma, consisting of a very distinct cortex with spore-mass entirely 

 filling the interior, chiefly spherical, 120-180^ in diameter; cortical cells light-brown, 

 usually radially elongate, rather uniform, prominent, 12-20^X4-10^; spores light-col- 

 ored, loosely packed together, ellipsoidal to spherical or polyhedral, with rather thick 

 smooth walls, chiefly 8-11 /i in length. 



On Alismaceae: 



Alisma Planiago-aquatica (A. Plajitago), California, Iowa, Kansas, Minnesota, Missouri, 

 Nebraska, New York, Washington, Wisconsin. 

 Type locality : Europe, on Alisma natans. 



Distribution : New York to Washington and California ; also in Europe and Asia. 

 Illustrations: Ann. Sci. Nat. VI. 15 : pi. 16, /. 1-4 ; Ann. Bot. 6: pi. 1, f. 1, pi. 2, f. 

 68-70; E. & P. Nat. Pfl. 1^** : 22. /. ISA ; Brefeld, Unters. Gesammt. Myk. 11 : pi. 11, f. 16-19. 

 ExsiCCATi: Ellis, N. Am. Fungi 1485 ; ElHs & Ev. Fungi Columb. 476 ; Sydow, Ust. 186. 



5. Doassansia opaca Setch. Proc. Am. Acad. 26 : 15. 1891. 



Sori in leaves, forming evident opaque subcircular pustules about 2-5 mm. in diameter 

 and showing elevations on both surfaces of the leaf, more or less scattered in yellowish or 

 reddish-brown usually widely discolored areas ; spore-balls closely compacted in a single 

 layer occupying most of the space between the two layers of epidermis, consisting of a very 

 distinct cortex and a mass of fertile cells entirely fllling the interior, oblong to subspher- 

 ical or cubical, 200-300// in greatest length; cortical cells reddish-brown, oblong or sub- 

 cubical, very prominent, about 14-27 // in length ; spores rather loosely compacted, chiefly 

 subspherical, with smooth walls, 10-15 /i in diameter. 



On Alismaceae : . ^ „. . 



Sagittaria latifolia {S. variabilis), Connecticut, Delaware, Ilhnois, Massachusetts, New 



York, Rhode Island. 

 Type locality: Newton, Massachusetts, on Sagittaria variabilis {S. latifoha). 

 Distribution: New England to Delaware and Illinois. 



