HI Suvarna,
Are you speaking about spawn??? Where are you located??? You can source the mushroom seeds (Spawn ) in all the agriculture departments. Please approach them. If you can give me your location, I can provid ethe correct address and contact details to obtain spawn.
How to make a spawn
Make your spawn. Place a small piece of mushroom on an agar medium in petri dishes, keep it moistened and under the proper temperatures for that particular mushroom; the mycelium will grow out and fill the dish in about two weeks. Agar medium is a gelatinous substance made from seaweed cells that is commonly used in laboratory work.
REgards
Ashwini S