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The vegetation of Swedish lakes 37Fig. 9. Lake Vettasjarvi, Torne lappmark, 55 km NE of Gallivare; lat. 67° 30'; alt. 352 m; area 10 sq. km; annual waterlevel change very small. Stands of Equisetum fluviatile, Menyanthes and Carex 1·ostrata in shallow water, flowel'ing Cicutavirosa in background. Vettasjarvi is the northernmost locality for Fissidens Julianus. Nos toe Zetterstedtii occurs abundantly.July 21, 1961. Photo G. Lohammar.Fig. 10. Lake Vettasjarvi. Cicutavirosa grows luxuriantly on theshore of a nearly disconnected bay.The water depth is about t metre.The bottom becomes frozen inwinter, which may explain thealmost total absence of a benthicvegetation of vascular plants. Insouthern Sweden a bottom of thesame character would be accessibleto plant growth. July 23, 1961.Photo G. Lohammar.Acta Phytogeogr. Suec. 50

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