Greetings Desert dwarf,
I don't know a lot about ferns, but I found a link with a Lilysoma bonsai in Scottsdale, Arizona on the Phoenix Bonsai Club page that belongs to Fairlee Winfield:
http://www.users.qwest.net/~rjbphx/Display/Lysiloma.html
Maybe you could contact the club and get some specific information from the club?
rjb@phoenixbonsai.com
Here is a basic page:
http://www.plantadviser.com/plants/lysithor.shtml