%0 Journal Article %A Briner, GP %A Gream, GE %A Riggs, NV %T Chemistry of Australian Lichens. I. Some Constituents of Parmelia conspersa (Ehrh.) Ach., Ramalina fraxinea (L.) Ach., Usnea barbata (L.) Wigg., and U. ceratina Ach., from the New England Region %J Australian Journal of Chemistry %D 1960/06/01 %V 13 %N 2 %P 277-284 %K %R https://doi.org/10.1071/CH9600277 %U https://www.publish.csiro.au/paper/CH9600277 %X Each of the species named in the title has yielded (+)-usnic acid, as found in previous investigations in other parts of the world. Other aromatic constituents isolated, except salazinic acid from Parmelia conspersa differ from those previously reported and include a new compound from P. conspersa. It is suggested that usnaric acid, previously obtained from Usnea spp. but unidentified, was a mixture of salazinic and norstictic acids. D-Mannitol or D-arabitol has been isolated from the water-soluble fractions.