The Strange Case Ofocellomma Rediuntum(Arthoniales:Roccellaceae) In Australia: A Remarkably Disjunct Lichen

The new combinationOcellomma rediuntum(Stizenb. ex Hasse) Kantvilas, Gueidan & Tehler is proposed, supported by morphological, anatomical and molecular data. Hitherto known only from the Californian coast, this species is here recorded for Kangaroo Island (South Australia), Victoria and Tasmania. It is described and illustrated from Australian collections. The ecology of the species and its remarkable distribution are discussed.