Urocysiis. 285 



On DiUiylis glomerata, TriticiDu repens, Holclnis ianaiits. 

 June to September. 



Biology. — Fischer v. Waldheim says that the germination is 

 similar to that of T. tritici. 



UROCYSTIS. Rab. 



Pulverulent ; spore-balls consisting of a variable number of 

 dark, smooth, large teleutospores placed centrally, surrounded by 

 a number of smaller, paler pseudospores, which do not germinate. 

 Germination of the central teleutospores as in Tilletia. 



Urocystis occulta. (Wallr.) 



Spore-masses black, forming long lines on the leaves, stems, and 

 leaf-sheaths. Spore-balls round or elliptical, consisting of i to 

 3 spores, surrounded by a variable number of pseudospores, 

 16-25 X 15-20/X. Teleutospores irregularly rounded, con- 

 tiguous surfaces flattened, smooth, opaque, dark brown, 

 10-18/X in diameter. Pseudospores irregularly but generally 

 distributed around the circumference of the spore-ball, sub- 

 hemispherical, pale brown, 4-6/-1 high. Mycelium annual. 



■ Synofiyms. 



Schrot., loc. cit, p. 279. Winter, loc. cit., p. 119. 



Erysibe occulta. Wallr., " Flor. Crypt. Germ,," vol. ii. p. 212. 



Urocystis occulta, Preuss. Cooke, " Hdbk.," p. 517. 



Urocystis parallela, B. and Br. Cooke, "Micro. Fungi," 4th 

 edit., p. 232, t ix. figs. 187, 188. 



Uredo parallela, Sow. Berk., " Eng. Flor.," vol. v. p. 375, in 

 part. 



On Secale cereale. 

 Biology. — See p. 93. 



Urocystis agropyri. (Preuss.) 

 Produced in parallel lines on the leaves, black. Spore-balls sub- 

 globose, 20-26 X 15-20/a. Teleutospores from i to 3, 



