TUBERCULINA. 



32T 



Tuberculina. 



Mycelium parasitic on hyphae and spore-patches of Uredinme. 

 Short rod-like hyphae spring from the spore-patches, and give 

 off' from their apices, globose conidia, which on germination 

 produce branched promycelia bearing sickle-shaped conidia. 



Fio. 179. — Schinzia cyptricola on Cyperus flavescens. Several roots show palmately- 

 divided swellings. Isolated spore. (After Magnus.) 



Tuberculina persicina Ditm. The lilac-coloured spores are 

 found on aecidia of I'eridcnntum 2nni and other aecidial forms, 

 also on some species of Cacoma} (Britain and U.S. America.) 



^ Plowright (British Ustilagineae) gives also Aec. afiperi/olii, Aec. tumlaninin 

 and Roe-ftelia lacerata as hosts. 



