I haven't seen people who are using rice straw here @eunoia101. The common i saw is that they are using banana leaves. I remember some groups teach us how to grow it and made a demo in my aunt's house before. I am amaze how the mushroom grow out of those banana leaves but I already forgot how they did it. im only 13 years old that time. I only remember it seems there is some seeds beeing put in it and then they covered those dried banana leaves with plastic.