Agar slants in test tubes allows you to save mycelium for 1-3 years. No pour agar and tips on how to store mushroom culture in agar slants for longer: low nutrient agar media, using wooden sticks, mineral oil or liquid paraffin for long term storage| shroomok.com
Dung agar media recipes based on dry manure (horse, cow, elephant, camel, zebra, turtle etc.) for cultivation of Panaeolus aka Copelandia mushrooms and other species that love manure substrates| shroomok.com