NOTES ON NEARCTIC HEPATICAE XVIII NEW LOPHOZIACEAE FROM THE ARCTIC ARCHIPELAGO OF CANADA

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Abstract
The difficult genus Lophozia, of widespread distribution in the cooler and cold regions of the northern hemisphere, includes a high number of technical species, some of which are very poorly understood. During the summer of 1955 the writer collected extensively on the north coast of Ellesmere Island and was able to study, in the living condition, the high-arctic representatives of this genus. Four species not previously found in the Arctic Archipelago of Canada, three of which are new to the western hemisphere, were collected. Two of these, L. groenlandica and L. opacifolia, are first reported from the Canadian Archipelago in this paper. Two others, L. pellucida and L. hyperarctica, appear to be new to science. These belong to the subgenera Lophozia and Massula, respectively. Since these species are not alluded to in my "Conspectus" of 1951, and since no treatment of them exists in the American literature, the following detailed treatment is provided.