. Bulletin of the British Museum (Natural History). . Figs 39-42 Equisetites lyellii (Mantell). 39, SEM montage of leaf sheath of aerial shoot showing sculptured cells of the commissures; dotted lines indicate positions of leaf tips broken during preparation; from fragment parting, , x 50. 40, naturally oxidized piece of internode cuticle from fragment parting showing stomata in broad band, probably internode of aerial shoot from above ground level; , x 125. 41. 42, two of the stomata (only 5 or 6 were found) from specimen in Fig. 39; x 1000. Figs 43-44 Equisetum sylvat
. Bulletin of the British Museum (Natural History). . Figs 39-42 Equisetites lyellii (Mantell). 39, SEM montage of leaf sheath of aerial shoot showing sculptured cells of the commissures; dotted lines indicate positions of leaf tips broken during preparation; from fragment parting, , x 50. 40, naturally oxidized piece of internode cuticle from fragment parting showing stomata in broad band, probably internode of aerial shoot from above ground level; , x 125. 41. 42, two of the stomata (only 5 or 6 were found) from specimen in Fig. 39; x 1000. Figs 43-44 Equisetum sylvaticum Linnaeus. Internode stomata of living species, showing silicified surface closely resembling E. lyellii; x 1000. transverse section, and a reconstructed section which is mostly based on the available information, but has added features which are purely conjectural. The exact position of the surface ridges is not clear as it appears to vary, but the arrangement in slide (Fig. 35) is taken as typical. It should be pointed out that in living species of Equisetum the surface ridges are on the same radii as the vascular bundles. In none of the sections have we been able to identify the leaf- sheath surrounding the stem. One should consider the possi- bility that the layer we have identified as outer cortex might in fact be the leaf sheath very closely pressed into the contours of the stem surface. This interpretation would produce sharply defined shallow notches separating broad, flat ridges opposite the vascular 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 British Museum (Natural History). London : BM(NH)
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