MACROLICHENS OF THE COPPERMINE, HOOD, AND THOMSEN RIVERS, NORTHWEST-TERRITORIES, CANADA

One hundred and sixty-three taxa of foliose and fruticose lichens are reported from three regions of the Canadian Arctic. The northernmost collecting region, and that with the most severe climate, is the Thomsen River valley on Banks Island. Also included are the Hood River valley, entirely north of the arctic treeline, and the Coppermine River valley, which flows northward through the forest-tundra border. Newly reported for Banks Island are Cladonia alaskana, Peltigera rufescens, Solorina bispora, S. saccata, and Vulpicida pinastri. Of these five, C. alaskana and V. pinastri have not previously been reported on any of the arctic islands. The macrolichen flora of these areas consists primarily of wide-ranging arctic-alpine and arctic-boreal species.