. Fossil plants : for students of botany and geology . Paleobotany. 102 LYCOPODIALES [CH. feature on Lepidodendron leaf-basest The diagram reproduced in fig. 144, B, may be taken as practically correct, as the patches of aerenchyma described by Weiss do not differ essentially from the parichnos tissue. The parichnos scars are shown on the leaf-scar and cushion in fig. 146, C. In the lower leaf-cushion shown in fig. 146, E, the infra-foliar parichnos scars, p, are clearly seen, but the preservation of the leaf-scar is not sufficiently good to show them It P Qe â. Fio. 145. A. Diagrammatic surfa
. Fossil plants : for students of botany and geology . Paleobotany. 102 LYCOPODIALES [CH. feature on Lepidodendron leaf-basest The diagram reproduced in fig. 144, B, may be taken as practically correct, as the patches of aerenchyma described by Weiss do not differ essentially from the parichnos tissue. The parichnos scars are shown on the leaf-scar and cushion in fig. 146, C. In the lower leaf-cushion shown in fig. 146, E, the infra-foliar parichnos scars, p, are clearly seen, but the preservation of the leaf-scar is not sufficiently good to show them It P Qe â. Fio. 145. A. Diagrammatic surface-yiew and longitudinal eection of a Lepidodendron leaf-cushion. B. Aerenchyma below the leaf-scar. (After F. E. Weiss.) on that part of the fossil. In the upper cushion (fig. 146, E) the position of the parichnos arms is shown on the leaf-scar, but the infra-foliar parichnos scars are hidden by two small spiral shells. The genus Spirorbis, to which these shells are referred, appears to have persisted from the Silurian epoch to the present day. The comparatively frequent occurrence of Spirorbis shells on the leaves and other parts of Palaeozoic plants, has recently 1 For a fuller account of the parichnos, see Hill, T. G. (06) and other papers quoted by F. E, Weiss (07).. 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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