Peronosclerospora eriochloae sp nov and other downy mildews on native grasses in Queensland, Australia

A new species of downy mildew, Peronosclerospora eriochloae, found on Erioc hloa pseudoacrotricha, is described and illustrated. The morphology and tax onomic status of Peronosclerospora noblei, found only on Sorghum leiocladum in Australia are discussed. Both downy mildews are systemic within their h osts, the asexual and sexual states developing on vegetative tillers which have more nodes and wider leaves than healthy flowering tillers. The morpho logy of the sexual states of unidentified downy mildews on three other wild grasses, known only from herbarium material, is also given.