I too ponder with this question. Which plant is suitable? Trees like apple is not available here and our tropical trees are toxic to gliders. We must take into account that gliders are tree sap eaters, so it will be natural for the glider to chew the bark.
I do have a website that gives a guide on what is safe and what is not, but I have never had the time to Google the plants to get pictures. So today, my post would be on plants and trees that are safe for gliders that we can find in Malaysia.
JUST A NOTE:
Beware of pesticides, some plants may have been heavily sprayed with pesticides, fungicide and poisonous fertilizers.
Great website MoonDance Sugar Gliders
This is the Albizzia tree. I have seen it in Malaysia. It is categorized as non-toxic.
Picture is from http://www.icangarden.com
This is also another plant that I have seen quite often locally. Beware of pesticides. This I saw sold at most plant nurseries and even shopping malls. It is called Pilea cadierei or Aluminum Plant.
Picture from http://www.dkimages.com
This is Asparagus Fern. An ornamental fern. A very fine looking type of fern that is safe when eaten. Can be found at most nurseries.
Picture from http://www.goldenseed.net
Common Bamboo is also safe for gliders. Use it to decorate the cage for gliders to climb about.
Picture from http://www.bbc.co.uk
This is a very common local fern. Can be found on tree tops. Called Bird’s Nest Fern.
Picture from http://www.nehrlinggardens.org
Canna Lily, I even have this at home but didn’t know it is safe for suggies till today. Well, I don’t think this plant would make a good perch for a glider to be on, but then it is safe.
Picture from http://flickr.com/photos/flaviocb
Well, this is only PART 1. I will update with PART 2 later because it takes time for me to look for the pictures and discription and also locating info on the toxic level of the plant.