254 British Uvedinee and Ustilaginee. 
CRONARTIUM. Fries. 
Teleutospores unicellular, compacted into a cylindrical body, 
germinating at maturity on the living host-plant. Promycelial 
spores almost spherical, pale. Uredospores enclosed in a pseudo- 
peridium, which surrounds the base of the cylinder of teleutospores, 
Cronartium flaccidum. Alb. and Schw. 
Uredospores—Sori small. Pseudoperidia broadly conical, dark 
yellow, persistent. Spores elliptical or ovate, echinulate, 20-30 
X 13-20pm. 
Teleutospores—Sori cylindrical, often curved, about 2 mm. high. 
Spores oblong or cylindrical, brown, 10-12 across. 
Synonyms. 
Spheria flaccida, Alb. and Schw., ‘‘Consp.,” p. 31. 
Cronartium peonia, Cast. Cooke, “ Micro. Fungi,” 4th edit., 
p. 215. 
Cronartium flaccidum (Alb. and Schw.). Winter, Zoe. cit., p. 236. 
On Paonia officinalis. In gardens. North Wootton; C.B. P. 
South of England; Miss Jelly. 
APPENDIX. 
IMPERFECT FORMS, OF WHICH THE FULL Lire-HIsTory 1s 
UNKNOWN. 
UREDO. 
Spores produced singly on the terminal ends of mycelial 
hyphze (basidia). Germination by a germ-tube which does not 
produce promycelial spores, but enters the host-plant through its 
stomata. 
