. The Eusporangiatae; the comparative morphology of the Ophioglossaceae and Marattiaceae. Ophioglossaceae; Marattiaceae. J92 THE MARATTIALES younger leaf. Fig. 175, E, shows a young leaf from another plant, in which one side has been cut away so as to show the relation of the stipules to the leaf base. This leaf was still coiled up and its apex was quite concealed within the large overlapping stipules. Both as to its position and its relation to the stipules, the commissure exactly resembles the lip-like basal extension of the stipular sheath m Botrychium and Helminthostachys, and there is no
. The Eusporangiatae; the comparative morphology of the Ophioglossaceae and Marattiaceae. Ophioglossaceae; Marattiaceae. J92 THE MARATTIALES younger leaf. Fig. 175, E, shows a young leaf from another plant, in which one side has been cut away so as to show the relation of the stipules to the leaf base. This leaf was still coiled up and its apex was quite concealed within the large overlapping stipules. Both as to its position and its relation to the stipules, the commissure exactly resembles the lip-like basal extension of the stipular sheath m Botrychium and Helminthostachys, and there is no reason to suppose that it is not exactly homologous with this. Partially inclosed by the stipular sheath of the expanded leaf is the next younger leaf, which is cut in a plane nearly at right angles with that of the oldest leaf, so that the overlapping of the stipules, which entirely conceal the rest of the leaf, is very plainly seen (fig. 175, B, /=). Within the stipular sheath of this leaf is a still younger one, which is entirely concealed from view from the outside, but shows plainly in longitudinal sections, taken next to the center of the bud. The stem apex is entirely concealed within the sheath of the younger leaf. The resemblance of this section of. Fig. 175- -Marattia alata Smith. A, B. Young plant developed as a bud upon an old leaf base. The outer tissue has been cut away, and the two sides of the thick central section are shown. XI. C. Section of petiole of leaf. D. Three sections of a rhizome of a small plant. E. Young leaf. The lamina is coiled up within the large stipules, st. In (i) one of the stipules has been cut away to show the commissure, com. the young plant to a similar section of the bud in one of the larger species of Botry- chium or o{ Helminthostachys is sufficiently striking. The bundles forming the ring in the petiole anastomose freely in the leaf base, as they do in Kaulfussia or Ophioglossum. pendulum, so that the number of strands in
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