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.
A robust mushroom with a purplish brown cap, about 40 mm wide. Some viscosity seen on cap which had a broad flattened umbo. The stipe was pale with blue longitudinal fibrils, widening at the base and then tapering. Gills were tan with a grey tint. Spore print tan with a hint of purple.
Spotted growing on damp sandy soil, in leaf litter in a reserve of mixed natives.