This is a pigeon-hole for those in the Jelly-like; smooth, featureless surface category that present a challenge to identification. In particular immature or partially dried specimens of Dacryopinax and Heterotextus can be hard to tell apart in photos.
The zz is there simply to force this group to the end of the alphabetic list of genera/species, since this category would be of no relevance to most users of Canberra Nature Map.
zz jelly-like puzzles is listed in the following regions:
Canberra & Southern Tablelands