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In the "Mushroom Growers' Handbook 1" at www.mushworld.com there is a tek described that uses dried and ground hay as a substrate. The ground hay is usually supplemented with wheat bran, rice bran, calcium carbonate and sugar. Sterilization takes either 2 hours at 121 degrees Celsius or 6 hours at 100 degrees celsius.
In the article it says that following species have been tested on that substrate: