Selenium and its species in the aquatic moss Fontinalis antipyretica

► Se and its species were investigated in the aquatic moss Fontinalis antipyretica. ► Se is accumulated to 2250 ng g− 1, bioconcentration factor over 103. ► Enzymatic or water extraction gave 25% of soluble Se. ► Se(IV) and Se(VI) but no organic Se compounds were identified in extracts. ► F. antipyretica could be used for Se biomonitoring.