The difficult genusLophozia, 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. groenlandicaandL. opacifolia, are first reported from the Canadian Archipelago in this paper. Two others,L. pellucidaandL. hyperarctica, appear to be new to science. These belong to the subgeneraLophoziaandMassula, 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.
展开▼
