King of Pearl (Pleurotus ostreatus) is a high yielding strain that is tolerant to a range of growing conditions and can be easily grown year round. It will produce cream color - grey to dark brown mushrooms depending on growing conditions, mostly temperature.  (Sporeless)
 
Substrate: Pasteurized straw, Hardwood Sawdust
Colonization/Fruiting Temperatures: 70-75F/50-87F