A member of our forum collected some G. cleistanthum, there are some good photos here: http://www.aquariumlife.com.au/showthread.php/12348-trip-to-the-snowy-mountains-aquatic-IDs-P
post no. 10.
You may also wish to look at the herbarium page for Glossostigma in NSW, includes G. elatine, G. cleistanthum and G. diandrum http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=gn&name=Glossostigma
post no. 10.
You may also wish to look at the herbarium page for Glossostigma in NSW, includes G. elatine, G. cleistanthum and G. diandrum http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=gn&name=Glossostigma