Studies on Puccinia polysora Underw. I. The world distribution of forms of Puccinia polysora
Transactions of the British Mycological Society 41(1): 89-94
An examination of herbarium material of Puccinia polysora from all areas of the world revealed two main size groups of uredospores. The smaller group was encountered in South East Asia and neighbouring islands with the exception of Borneo, and the larger group in the West Indies, Africa and the South Indian Ocean. The two main groups are consistent with the two directional spread, westwards and eastwards, from the origin of the rust, the Caribbean area. As data on cross-inoculation studies are lacking it is uncertain if distinct forms of P. polysora exist.