What is agar and what can it be used for??
http://www.shroomery.org/5242/What-is-agar-and-why-might-it-be-interesting-to-me (http://www.shroomery.org/5242/What-is-agar-and-why-might-it-be-interesting-to-me)
Check that out! It's something I've never done, so I hope it answers your questions.