Description of Plate XVIII.
Fig. 1.—Front view of a scale half the natural size. It is composed of cellular tissue filled with starch grains, fibro-vascular bundles, and covered by an adhering bark. The cut section shows numerous small orange-coloured spots, which exude on the surface, when newly cut, a viscid gum-resinous matter.
Fig. 2.—A scale after three months in the ground, showing the method of bud growth with roots proceeding from the bottom of the bud. Half the natural size.
Figs. 3 and 4 are two illustrations of the frond growth above ground, showing the croziers in two stages of development, and the formation of the adnate stipules. Half the natural size.
Fig. 5.—Root process, showing rootlets proceeding chiefly from the lower side of root; the whole very flexible. Half the natural size.
Figs. 6 and 7 A.—Sections of root enlarged. The chief component mass is cellular tissue and starch grains, with lacunæ. There is also a starshaped
shaped nuclei of fibro-vascular and scalariform bundles. The bundles distinctly wedge-shaped, the root thus showing a stronger affinity in structure to the Equisetaceœ than to Ferns, and presenting an additional reason to the difference in Sporangia, why Marattiaceœ should be separated from Ferns.
Fig. 7.—Starch grains of Marattia fraxinea, Sm.
Note.—I am also of opinion, although requiring longer observation to prove satisfactorily, that the rhizomes of the New Zealand Botrychium and Ophioglossum are built up, or added to, by a similar method to that of Marattia.