. Elementary botany. Botany. 382 Ecology. figures of varied color. Disintegrating rock, debris of plants and animals, join to form the virgin soil. Certain of the blue- green algae, as well as some of the mosses, are able to gain a foothold on rocks and assist in this process of soil formation.. Fig. 481. 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. 482. 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 longer un- covered
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. Elementary botany. Botany. 382 Ecology. figures of varied color. Disintegrating rock, debris of plants and animals, join to form the virgin soil. Certain of the blue- green algae, as well as some of the mosses, are able to gain a foothold on rocks and assist in this process of soil formation.. Fig. 481. 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. 482. 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 longer un- covered by ice were being covered by plant life. One of the Greenland rock lichens is shown in fig. 483.. 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