14 
JOURNAL OF MYCOLOGY. 
[Yon. IV, Nos. 2, 3, 
This tegument of strictly united cells cannot be found in true Enty- 
loma, which otherwise perfectly correspond with Doassansia. 
In both genera the spores produce on germinating a promycelium 
provided only with acrogenous sporidiola disposed like a crown and 
united usually in twos. Entyloma and Doassansia following Selirceter’s 
plan of classification in his work now cited belong to Cohors Ustilaginece, 
Family Tilletiacea?■ and Subfamily Tilletiece. 
In the genus Doassansia the spores are either oval-globose or more or 
less angular, pale-colored, without (following Fisch [J]) a true endospore 
and germinate in water very easily. Our genus differs from the nearly 
allied genus Tubercinia , Fr., in the tegument of the sori. 
The relation I have observed between the matrix and a tegument 
protecting the mass of spores caused me to suspect that Rostrup’s Enty¬ 
loma Hottonice and Berkeley’s Protomyces Comari must be referred to 
Doassansia , and a microscopical examination confirmed fully this suspi¬ 
cion. By this criterion, even Johanson’s Entyloma Catabrosce (||), a species 
living on Catabrosa aquaticg , should belong to the genus proposed by 
Cornu; but 1 dare not affirm it, because I have seen no specimen of it. 
The studies on the fungi living on aquatic plants have been somewhat 
neglected, so that I can make but few observations on their geographical 
distribution. Some species like Doassansia Limosellce , Schioet, D. Neisslii , 
De Ton., are thus far limited to Germany; D. Cormari , De Ton. et Massee 
to Great Britain; D. Hottonice , DeTon., to Denmark; D. Cormari (Berk) 
De Ton. et Massee to Great Britain; D. Epilobi , Farl., D. decipiens , Wint., 
D. occulta, Cornu, to North America ; D. Martianoffiana , Schvce.. to 
Siberia and Germany; D. Alisimatis , Cornu, and D. Sagiitaria, Fisch., are 
spread more widely; the former has been found in Italy, France, Ger¬ 
many, Finland, Sweden, Siberia and North America; the latter in Italy, 
France, Belgium, Germany, England and North and South America. 
I close these short observations with many thanks to the M. Prof. 
P. A. Saccardo who, with his usual kindness, gave me free access to his 
valuable my cologic herbarium and otherwise aided me in the preparation 
of this paper. 
1. Doassansia Alismatis (Nees) Cornu. Sur quelques Ustilagi 
nees nouvelles ou peuconnues, p. 285, t. XVI, f. 1-4 (1883); Schrceter Pilzfl. 
Schles, p. 286; Sclerotium Alismatis , Nees., in Fr. Syst. Mycol., Vol. II, p. 
257 (1822); Perisporium Alismatis , Fries , Syst. Mycol., Vol. Ill, p. 252; 
Dothidea Alismatis , Lasch., in Rabenhorst Herb. Mycol., I edit., n. 553 et 
II edit., n. 162; UredoAhsmacearum, Crouan, FI. Finist, p. 8 (?); Entyloma 
Alismacearum , Sacc., in Michelia II, p. 44, n. 434; Mori Funghi di Modena, 
n. 14; Protomyces maculciris, Fuckel., in Thum. Myc. Univ., n. 1417, non 
$ 3. C. Fisch.—Zur Entwickelungsgeschichte von Doassansia SagMarias. Berichte 
der deutsch. botan. Gesellschaft, II. Berlin, 1884. 
H 4. Johanson.—Svatnpar fran Island. Oefversigt af Kongl. Vetenskaps. Akade- 
misy Foerbandlingar n. g. Stockholm, 1884. 
