. Fossil plants : for students of botany and geology . Paleobotany. xv] LEPIDODENDRON 179 distance below the apex of each area there is a more or less circular prominence or depression (fig. 187, B) and on a few of the areas there are indications of a groove (lig. A, g) extending from the raised scar to the pointed base, as at g, g. In examining the graphitic layer on the surface of the South African specimen shown in fig. 187, A, use was made of a method recently described by Professor Nathorst'. A few. Fig. 187. Lepidodendron australe. Fig. A, nat. size. drops of collodion were placed on the
. Fossil plants : for students of botany and geology . Paleobotany. xv] LEPIDODENDRON 179 distance below the apex of each area there is a more or less circular prominence or depression (fig. 187, B) and on a few of the areas there are indications of a groove (lig. A, g) extending from the raised scar to the pointed base, as at g, g. In examining the graphitic layer on the surface of the South African specimen shown in fig. 187, A, use was made of a method recently described by Professor Nathorst'. A few. Fig. 187. Lepidodendron australe. Fig. A, nat. size. drops of collodion were placed on the surface, and after a short interval the film was removed and mounted on a slide. The addition of a stain facilitated the microscopic examination and the drawing of the collodion film. The cell-outlines (fig. 187, C) on the surface of the polygonal areas may be those of the epidermis, but they were more probably formed by a sub- epidermal tissue; the scar, which interrupts the continuity of the flat surface, may mark the position of a leaf-base, or, 1 Nathorst (07) ; Bather (07); (08).. 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 Seward, A. C. (Albert Charles), 1863-1941. Cambridge : University Press
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