Elvebakk, ArveElix, John2015-12-070024-2829http://hdl.handle.net/1885/22460Pannaria isidiosa sp. nov. is newly described from montane forests in New South Wales, Australia. It is characterized by abundant globose to coralloid isidia, long-ellipsoid spores with a verrucose and citriform perispore. It is related to P. xanthomelana, but in addition to pannarin and porphyrilic acid, it contains methylplacodiolic acid and a chemosyndrome of four unidentified terpenoids.Keywords: Bacteria (microorganisms); Pannaria; Pannariaceae Australia; Lichens; Methylplacodiolic acid; New species; Pannaria; Pannariaceae200610.1017/S00242829060061412015-12-07