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In page Small mountain ringlet:

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The larva is green with a double dorsal and a single lateral white or yellowish line. The third instar larvae hibernate in grass tussocks. They emerge in the spring and recommence feeding. Some larvae spend two years in this stage, the result of a late spring and short summer restricting growth. Recorded larval food plants are Aira praecox (Czechoslovakia, Spain), Deschampsia cespitosa (Czechoslovakia), Festuca ovina (Spain), Nardus stricta (British Isles) and Poa annua (Spain)