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Ascochyta   koolunga    (  Didymellaceae  ,   Pleosporales  ) was first described in 2009 (as    Phoma   koolunga   ) and identified as the causal agent of   Ascochyta   blight of    Pisum   sativum    (field pea) in South Australia. Since then    A.   koolunga    has not been reported anywhere else in the world, and its origins and occurrence on other legume (  Fabaceae  ) species remains unknown. Blight and leaf spot diseases of Australian native, pasture and naturalised legumes were studied to investigate a possible native origin of    A.   koolunga   .Ascochyta   koolunga    was not detected on native, naturalised or pasture legumes that had leaf spot symptoms, in any of the studied regions in southern Australia, and only one isolate was recovered from    P.   sativum   . However, we isolated five novel species in the   Didymellaceae   from leaf spots of Australian native legumes from commercial field pea regions throughout southern Australia. The novel species were classified on the basis of morphology and phylogenetic analyses of the internal transcribed spacer region and part of the RNA polymerase II subunit B gene region. Three of these species,    Nothophoma   garlbiwalawarda    sp. nov. ,    Nothophoma   naiawu    sp. nov.  and    Nothophoma   ngayawang    sp. nov. , were isolated from    Senna   artemisioides   . The other species described here are    Epicoccum   djirangnandiri    sp. nov.  from    Swainsona   galegifolia    and    Neodidymelliopsis   tinkyukuku    sp. nov.  from    Hardenbergia   violacea   . In addition, we report three new host-pathogen associations in Australia, namely    Didymella   pinodes    on    S.   artemisioides    and    Vicia   cracca   , and    D.   lethalis    on    Lathyrus   tingitanus   . This is also the first report of    Didymella   prosopidis    in Australia.

Cryptic diversity found in Didymellaceae from Australian native legumes