Taxonomic Studies on Australian Isolates of Stemphylium spp. And Associated Teleomorphs
JAG Irwin, R Dill-Macky and M Stirling
Australian Journal of Botany 34(3) 281 - 292
Abstract Taxonomic studies on monosporic pure cultures of Australian isolates of Stemphylium revealed the
presence of three species, namely S. botryosum, S. globuliferum and S. vesicarium. A group intermedi-
ate between S. botryosum and S. vesicarium but more closely resembling S. vesicarium was recognised.
The circumscription of S. vesicarium was broadened to accommodate this taxon which was found on
Medicago sativa, M. rugosa and Simmondsia chinensis. Studies on herbarium specimens deposited as
S. botryosum on M. sativa from a number of overseas locations indicated that in all cases the pathogen
fitted our concept of S. vesicarium.
Teleomorphs were induced in pure culture for each of the above-mentioned anamorphs, and in all
instances the teleomorph was identified as Pleospora herbarum. The ascospore morphology was similar
for all isolates, and the shape of the ends of the spore and the number of longitudinal septa were variable
characters even within an isolate. However, the teleomorphs could be separated into two distinct groups
on the basis of ascal length.
Full text doi:10.1071/BT9860281
© CSIRO 1986





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