200 MILDEWS, RUSTS AND SMUTS 
Sphacelotheca hydropiperis, De Bary; Plowr., Ured. 
282. 
Spore-mass produced in the ovary, which becomes swollen 
and projects beyond the perianth, the receptacle becoming 
open at the tip, when the spores escape as a blackish- 
violet powdery mass ; irregularly globose or elliptical, 
wall blackish-violet, smooth, or rarely minutely granular, 
9—21 X 8—12 (jl ; promycelium cylindrical, 3-septate, 
promycelium spores produced laterally on the promycelium 
in numbers, elliptical, conjugating in pairs. 
Syn. Uredo hydropiperis, Schum. 
Ustilago hydropiperis, Schroet. 
Ustilago candollei, Tub 
In the ovary of Polygonum hydropiper, P. persicaria, 
P. viviparum, P. mite. 
France, Italy, Germany, Finland, N. and S. America. 
DOASSANSIA, Cornu 
Spores produced in dense clusters, enclosed by a recep¬ 
tacle formed of sterile cells of the mycelium, wall smooth ; 
germination by the production of a promycelium as in 
Entyloma. 
The present genus agrees with Sphacelotheca in having the 
spores enclosed in a special receptacle formed of mycelium, 
but differs in the absence of a columella, and in the different 
mode of origin of the promycelium spores. The receptacle 
is composed of a row of cells closely packed side by side, 
like the palisade tissue of a leaf. 
Doassansia alismatis, Cornu ; Plowr., Ured., p. 294. 
Sori forming large yellowish-brown pustules on both sides 
of the leaves, often numerous, sometimes growing into each 
other or arranged in circles, on pale yellowish spots ; 
spore-balls numerous ; spores subglobose, 9—14 p,, wall 
thin, smooth, tinged yellow, investing membrane of the 
spore-mass brown ; promycelium spores long, cylindrical, 
numerous at the tip of the promycelium. 
Syn. Uredo alsinacearum, Crouan. 
Entyloma alsinacearum, Sacc. 
On Alisma plantago. Often in company with Cylin- 
drosporium alismacearum, with which it may be genetically 
connected. 
Europe generally, S. Siberia, and United States. 
Doassansia sagittariae, Fischer ; Plowr., Ured., p. 295. 
Sori forming yellowish-brown pustules on the under 
