Available premeasured and presterilized in a kit-sized vial (enough to inoculate 35 petri dishes with 300+ spores/dish) or unsterilized in a bulk-sized vial (enough for 140 dishes). The bulk-sized vial comes with directions for spore surface sterilization. Store spores at room temperature in the dark; do not refrigerate. C-FERN® Spores are available presterilized and unsterilized. Presterilized Vial inoculates 35 dishes with 300-plus spores per dish. An Unsterilized Vial inoculates 140 dishes with 300-plus spores per dish; it comes with sterilization directions. Note: Store spores in the dark at room temperature; do not refrigerate.