8 Setchell. — An Examination of the Species 
sembles D. sagittariae in habit, but the sori are more regular 
in shape and structure, and the cortical cells more uniform 
and more radially elongated, than in D. sagittariae. The 
germination also seems to differ in the two species. 
Season. This species appears to range from June to 
September. 
Distribution. In Europe this species has been found in 
France, Cornu ; common in Germany, Lasch ! et at . ; Italy, 
Spegazzini! Saccardo, Mori\ Sweden, Johansonl Finland, 
Karstenl Scotland, Traill ; England, Berkeley! Currey . 
In Asia, in Western Siberia, Martianoff 7 In the United 
States, Iowa, Holway ! Wisconsin, Trelease ! Minnesota, 
Far low ! Nebraska, Pond\ New York, Setchell ! 
Literature 1 . 
Sclerotium alismatis , Nees, in Fr., Syst. Myc., Vol. II, p. 257. 1822. 
Perisporium alismatis , Fr., Syst. Myc., Vol. Ill, p. 252. 1829. 
Wallroth, Comp. FI. Germ., II, p. 747. 1833. 
Rab., Kryptfh, Bd. I, p. 230. 1844. 
Kirchner, Lotos, Bd. VI, p. 244. 1856. 
Dothidea alismatis , Kirchner, Lotos, Bd. VI, p. 205. 1856. 
Sphaeria ( Depazea ) alismatis 2 , Currey, Trans. Linn. Soc., Vol. XXV, 
P- 334, PI. LIX, f. 152. 1865. 
Uredo alismacearum , Crouan, FI. Finist., p. 8. 1867. 
Sphaeropsis alismatis , Cooke, Handbook, p. 429. 1871. 
Aecidium incarceratum 3 , B. & Br., Ann. & Mag. Nat. Hist., 4 ser., 
Vol. XV, p. 36, No. 1469. 1875. 
Protomyces macularis , Thuem., Bull. Imp. Soc. Nat. Moscow, p. 130. 
1877 (not Fuckel). 
1 The literature is given as fully as possible. The local North American liter- 
ature is complete, thanks to the valuable index prepared by Prof. Farlow and 
Mr. Seymour. 
2 Although I have seen no authentic specimen of this form of Currey’s, I have 
little hesitation in referring it to D. alismatis. Cf. also Passerini under 1093 
Erb. Critt. Ital. 
3 Berkeley says that this species occurs on Sagittaria sagittifolia , and De Toni 
and Plowright consider it to be identical with D. sagittariae. The specimens 
distributed by Berkeley in Fung. Eur. No. 1492, on an unnamed host, seem to me 
to be on a leaf of Alisma Plantago , and the characters of the sori are clearly those 
of D. alismatis. 
