Gall caused by a rust fungus, about 10cm across, on a large Acacia Mearnsii.
Update: Uromycladium tepperianum has been split into at least 16 different species each infecting a different range of Acacia species. The one on Acacia mearnsii is called Uromycladium murphyi. See "Diversity of gall-forming rusts (Uromycladium, Pucciniales) on Acacia in Australia" by C. Doungsa-ard et al, Persoonia vol. 40, 2018 pages 221–238.
2m Shrub - much larger phyllodes (about 8-10cm) than the A. oxycedrus and larger flower spikes.
Reserve has large areas covered with A. longifolia ssp. sophorae
Flora of Melb has this cross occurring in Frankston
A medium-sized bee-fly with slender narrow wings that were mostly clear. The leading edges of the wings were dark with the inner margins being thrown into waves. The abdomen was longer than in most other bee-flies.