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Rusts on Oxalis and Mahonia in Australia

J. Walker, Biological and Chemical Research Institute, Rydalmere, N.S.W.o 2116 In April 1976, a specimen of Oxalis corymbosa DC., a common weed species, heavily infected with a uredinial rust was found in a garden at West Pennant Hills (DAR 26594). During the following fortnight, several more specimens were submitted from the northern and western suburbs of Sydney. In some, both uredinia and telia were seen, enabling the rust to be identified as Puccinia oxetidis Diet. & Ell. This is its first record in Australia. Puccinia oxalidis occurs in North, Central and South America (1, 2, 4). There is also one record of a uredinial rust on Oxalis corniculata L. from North Africa which may refer to this species (3). P. oxalidis is a heteroecious, longcycled rust, with uredinia and telia on Oxalis spp. and pycnia and aecia on various species of Mahonia (Berberidaceae). In Australia, it has been found to date only on several species of Oxalis. Very heavy infection, leading to death of many leaves, has been seen on O. corymbosa and O. tetttotte H.B.K.. Lighter infection has been seen on O. bowiei W. Herbert ex Lindl., O. articulata Sav. and O. ceprine L. So far no rust has been found on O. corniculata L. and O. pes-caprae L. even when they were growing close to heavily infected plants of other species. Since first reported, the rust has spread rapidly and there are now records from both the far North Coast and the South Coast of N.S.W. It is expected that its pattern of spread will follow that observed with other introduced