Unfortunately as it is currently known, the genus Uromycladium is restricted in its host range to four genera within the Fabaceae (see Doungsa-ard, C.; McTaggart, A.R.; Geering, A.D.W.; Shivas, R.G. (2018) Diversity of gall-forming rusts (Uromycladium, Pucciniales) on Acacia in Australia, Persoonia Volume 40, June 2018, pp. 221-238). One or more fungi may be involved but not Uromycladium until someone can demonstrate otherwise.
It looks to me to be a fasciation a condition that causes distortion of the growing tip. This can be caused by a hormonal imbalance, genetic mutation, bacterial, fungal or viral infection, insect attack or physical injury.
Some of the information presented concerning Exocarpos cupressiformis (Cherry Ballart) on 7 Oct 2017 is now out of date. Uromycladium tepperianum has been split into a further 16 species, Uromycladium tepperianum in the strict sense is currently only known from Acacia cupularis, A. ligulata, A. rostellifera, A. sclerosperma and A. xanthina and occurs in South Australia and Western Australia. Uromycladium notabile was found to be based on two separate species so it has ceased to be recognised. The paper referenced by Scurfield 1965 appears not to have been followed up by anyone since that I can find - it might make a decent honours thesis to repeat the work and apply modern molecular techniques to the problem.
I have only just read these comments 5 years later and have accordingly looked up the 2018 paper that was not published at the time of writing my book The fungus gall on Acacia dealbata is T Murphyi according to this list of hosts.
There are two genera of gall forming fungi on Acacia dealbata representative species being Uromycladium murphyi and Endoraecium carnegiei. Aside from using molecular diagnostic methods they can be distinguished by examination of the spores under a compound microscope (400x is adequate). For Endoraecium see: A.R. McTaggart, C. Doungsa-ard, A.D.W. Geering, M.C. Aime, R.G. Shivas (2015) A co-evolutionary relationship exists between Endoraecium (Pucciniales) and its Acacia hosts in Australia. Persoonia 35: 50–62.
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