Abstract
Tilletia barclayana, T. indica, T. rugispora and T. boutelouae are a group of floret-infecting smuts characterized by densely tuberculate teliospores. A morphologically similar smut infecting Lolium mul- tiflorum was discovered in Oregon and the south- eastern USA in 1996, although herbarium records show a similar smut on L. perenne has been present in Australia for at least thirty years. Based on PCR- RFLP analysis of the rDNA and RAPD analysis, the U.S. ryegrass bunt is most similar to T. indica, but the relatively low similarity (ca 25%) in the RAPD analysis does not support conspecificity of the two taxa. Both RAPD and PCR-RFLP analyses suggest that T barclayana comprises at least two distinct taxa. One cluster corresponds to the rice-infecting isolates, and the other to isolates infecting species of Panicum and Paspalum. Tilletia boutelouae and T. rugispora are sup- ported as species distinct from T barclayana and T indica based on both RAPD and PCR-RFLP analyses.
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