More bud galls on Black Wattle. I have only seen this sort once. I think they might be caused by Asphondylia glabrigerminis. Species is described in P Kolesik, RJ Adair, G Eick (2010) "Six new species of Asphondylia (Diptera:Cecidomyiidae) damaging flower buds and fruit of Australian Acacia (Mimosaceae", Systematic Entomology 35:250–267.
There are some poorly reproduced photos in Adair, R.J., Burgess, T., Serdani, M. and Barber, P. (2009) Fungal associations in Asphondylia (Diptera: Cecidomyiidae) galls from Australia and South Africa: implications for biological control of invasive acacias. Fungal Ecology, 2 (3). pp. 121-134.
These are bud galls on Black Wattle, which I believe are caused by Dasineura rubiformis. The species is described in Kolesik, P., Adair, R.J., and Eick, G (2005) "Nine new species of Dasineura (Diptera: Cecidomyiidae) from flowers of Australian Acacia (Mimosaceae)", Systematic Entomology 30:454-479. You can find photos on the web from south africa and portugal since this species has been released for biological control of black wattle. It was found not to affect the growth of plantation trees, but drastically reduces seed production and therefore invasiveness. Species is fairly common in Woodlands Historic Park.
Female galls on Yellow Box. Counted at least 40 on a 2m high sapling. Almost all straight sided, just a few more bulbous. The longest was 20mm. Bulbous gall in the photo is 16mm long and about 6mm diameter.