All of these shrooms in the PF Shroom museum were grown identically - PF style in the "Richmans terrarium" - basically the PF neglect tek. No humidifiers or perlite layers were used to increase humidity. Only a couple of airings and mistings were done per day and sometimes less (neglect tek). Some have vermiculite casings on the tops and some are without. All have a "bottom" casing of wet perlite covered with vermiculite (in a jar cap) which keeps the cakes hydrated and adds to the humidity of the terrarium.