CLINTON: NORTH AMERICAN USTILAGINEAE. 
479 
Hosts: Sagittaria art folia, Ill.; S. graminea , Ill.; S. heterophylla , 
Wise, (type D. sagittariae forma confluens) ; S. variabilis , Ivans., 
Mo., N. Y., Ohio, Wise.; Sagittaria sp., Mo., Vt., Can. 
Cross seetions show the spore balls very abundant and often vari¬ 
able in eharaeter due to the crowding. Davis describes a form con¬ 
fluens on S. heterophylla which has larger spore balls than usual 
and which are often confluent. The species is closely related to 
Doassansia Alismatis. The germination of the spores has been 
described by Fisch and Brefeld. Literature: 23, 59, 160, 161. 
Doassansia Alismatis (Nees) Cornu. 
1 Sclerotium Alismatis Nees, Fr. Syst. Myc., 2 : 257. 1822. 
Perisporium Alismatis Fr., Syst. Myc., 3 : 252. 1829. 
Dothidea alismatis Ivirclm., Lotos, 6 : 205. 1856. 
Sphaeria Alismatis Curr., Trans. Linn. Soc., 22 : 334. 1859. 
Uredo alismacearum Cronan, FI. Finist, 8. 1867. 
Sphaeropsis alismatis Cke., Handb. Fungi, 429. 1871. 
Aecidium incarceration B. & Br., Ann. Mag. Nat. Hist., iv, 15 : 36. 1875. 
? Protomyces macularis Thiim., Bull. Imp. Soc. Nat. Mosc., 52 1 : 130. 1877. 
Phyllosticta Alismatis Sacc. & Speg., Mich., 1: 144. 1878. 
Entyloma Alismacearum Sacc., Mich., 2 : 44. 1880. 
Doassansia Alismatis Cornu, Ann. Sci. Nat., Bot., vi, 15 : 285. 1883. 
Phyllosticta Curreyi Sacc., Syll. Fung., 3 : 60. 1884. 
Exsiccati: Doassansia Alismatis (Nees) Cornu, on Alisma Plantago , 
Ell., N. A. Fungi, 1485, Ell. & Ev., Fungi Col., 476, Syd., Ust., 186. 
Sori in leaves, thin, forming at first yellowish but eventually red¬ 
dish brown spots, subcircular or irregular, distinct (5-12 mm.) or 
irregularly confluent, with spore balls showing as very minute 
chiefly epiphyllous elevations; spore balls situated in both palisade 
layer and spongy parenchyma, consisting of a very distinct cortex 
with sjiore mass entirely filling the interior, chiefly spherical, 120- 
180 /x in diameter; cortical cells light brown, usually radially 
elongated, rather uniform, prominent, 12-20 y x 4-10 y; spores 
light colored, loosely packed together, ellipsoidal to spherical or 
polyhedral, with rather thick smooth walls, chiefly 8-11 y in length. 
Host: Alisma Plantago , Calif., Ia., Ivans., Minn., Mo., Neb., N. 
Y., Wise. 
This is a rather widely distributed species and the one upon which 
1 The synonymy given here is taken from Setchell’s paper. 
