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Published online by Cambridge University Press: 26 April 2019
An identification key to the 39 species of Menegazzia recorded for Australia and its offshore islands (including Tasmania) is presented. Distribution patterns are discussed and summarized. Mainland Australia supports 19 species, with seven endemics, and shares 12 species with Tasmania, six with New Zealand and one with South America. The new species, Menegazzia williamsii Kantvilas from New South Wales, is described and is characterized by an inflated, fragile, esorediate thallus containing stictic acid but lacking isopigmentosin, 2-spored asci and an inspersed epihymenium. In addition, M. hypernota Bjerke, formerly known only from New Zealand, is recorded from Tasmania for the first time.