The name was referring to the valleys of the rivers Glomma, Rena, Trysilelva and Österdalälven (the parishes Idre and Särna belonged to Norway until 1644).
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Krog, Hildur; Østhagen, Haavard; Tønsberg, Tor (1994) Lavflora. Norske busk- og bladlav (Oslo) ISBN 82-00-41445-0