1 86 British Fungi. 



TJrocystis parallelaj Cke. Micr. Fung. t. ix, tigs. 

 167—188. 



On Avena elatior, Lolium perennej Triticum 

 vulgare, Secale cereale, Foa pratensis. Not un- 

 common. 



Urocystis agroinjri, Schroet. 



Sorii forming long, parallel, black lines on tlie 

 leaves ; spore-clusters subglobose or broadly ellip- 

 tical, 20-26 X 16-20 /Lt, central resting-spores 1 — 5 

 in number, 8-12 yu- diameter, peripheral sterile 

 cells in a single, often incomplete layer, 5-9 fju 

 diameter. 



TJrocystis agropyrij Schroet. Brand, u. Rostp. 

 ScMes. p. 7 ; Sacc. Syll. vii. ii. n. 1892 ; Plow. 

 Brit. Ured. and Ustilag. p. 285. 



Urocystis Fisclieri, Korn. Hedw. 1877, p. 34 j Plow. 

 Brit. Ured. and Ustilag. p. 286. 



On Triticum rep ens, Avena elatior ^ Festuca ruhra^ 

 Car ex glauca. Not common. 



Closely resembling JJ. occulta, if indeed distinct ; 

 the mycelium is said to be perennial. 



TJrocystis colchici, Rabenh. (figs. 86, 87). 



Sori black, forming rather large, swollen lines or 

 patches on the leaves and stem, soon bursting the 

 epidermis and becoming powdery; spore-clusters 

 globose or irregular, 20-35 x 16-20 fi, central 

 fertile spores 1 — 5, roundish or angular from mutual 

 pressure, smooth, chestnut-brown, 4-6 up to 10-15 

 fjb diameter ; peripheral sterile cells pale yellow- 

 brown, often in two layers, 7-11 fi diameter. 



TJrocystis colchici, Rab. Fung. Eur. n. 396 j Sacc. 



