. Lessons in botany. Botany. 312 ECOLOGY. the lichens lay hold on them and invest them with fantastic figures of varied color. Disintegrating rock, debris of plants and animals, join to form the virgin soil. Certain of the blue- green algse, as well as some of the mosses, are able to gain a foothold on rocks and assist in this process of soil formation.. Fig. 260. Rock lichen (Parmelia contigua). A view of rocks thrown down by the melting and retreating edge of a glacier in Greenland is shown in fig. 261. These rocks at the time the photograph was taken had no plant life on them. At other plac
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. Lessons in botany. Botany. 312 ECOLOGY. the lichens lay hold on them and invest them with fantastic figures of varied color. Disintegrating rock, debris of plants and animals, join to form the virgin soil. Certain of the blue- green algse, as well as some of the mosses, are able to gain a foothold on rocks and assist in this process of soil formation.. Fig. 260. Rock lichen (Parmelia contigua). A view of rocks thrown down by the melting and retreating edge of a glacier in Greenland is shown in fig. 261. These rocks at the time the photograph was taken had no plant life on them. At other places in the vicinity of this glacier, rocks. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Atkinson, George Francis, 1854-1918. New York, H. Holt and company