Three new species of Tilletia on Eriachne from north-western Australia

• Three new species of Tilletia are described from species of Eriachne.
• Tilletia mactaggartii sp. nov. is described from E. burkittii.
• Tilletia geeringii sp. nov. is described from E. festucacea.
• Tilletia marjaniae sp. nov. is described from E. pulchella subsp. dominii.

Three new species of Tilletia are described from species of Eriachne (Poaceae) in the arid tropics of north-western Australia. In Western Australia, T. mactaggartii sp. nov. infects E. burkittii, and T. geeringii sp. nov. infects E. festucacea. Tilletia marjaniae sp. nov. infects E. pulchella subsp. dominii in Western Australia and the Northern Territory. These species are the first records of Tilletia on Eriachne. Phylogenetic relationships of these species were inferred from internal transcribed spacer of ribosomal RNA region and large subunit ribosomal RNA gene sequences.