Essential oil characterisations of Pittosporum angustifolium presented in this study demonstrate potential chemovariation within Pittosporum angustifolium. At present further work is required to clarify such variation,or additionally,to clarify if the reported geographical differences in Aboriginal medicinal use parallels chemical differences reflected geographically.In the present study, the higher bioactivity of NS166 essential oils could be attributed to acetic acid decyl ester,present at approx. 32% (Table 5) and not found in the other essential oils.However,other sesquiterpenes were found in this oil at a higher concentration as well,such as bicyclogermacrene, which is known to have high antimicrobial and moderate antifungal capacity (Koroch et al.,2007).