. Carnegie Institution of Washington publication. Fig. 172. A, B. Two longitudinal sections of a young sporophyte of Marattia dougJasii. I2, second leaf; r", second root. Xiao. C. Part of primary root, showing cells in- fected by endophytic Fig 173. Section of a young sporophyte of Marattia douplasii. <r, stem apex; /, young leaves; r, roots. X 25. and scales like those we have seen in the other genera. They are more like those of Kaulfussia than like the peltate scales found in Daneea. Sections of a somewhat older sporophyte are shown in figure 172, this section being made at
. Carnegie Institution of Washington publication. Fig. 172. A, B. Two longitudinal sections of a young sporophyte of Marattia dougJasii. I2, second leaf; r", second root. Xiao. C. Part of primary root, showing cells in- fected by endophytic Fig 173. Section of a young sporophyte of Marattia douplasii. <r, stem apex; /, young leaves; r, roots. X 25. and scales like those we have seen in the other genera. They are more like those of Kaulfussia than like the peltate scales found in Daneea. Sections of a somewhat older sporophyte are shown in figure 172, this section being made at right angles to the one just described. The cotyledon in this specimen was fully expanded and the primary root had penetrated into the earth. The arrangement of the bundles was the same as in the younger sporophyte described, except that the third leaf was now visible and the second root was already will advanced. I he section passed exactly through this root, the stele <if which is seen to join that of the second leaf and is practically continuous with it. The young trace from the third leaf joins the second leaf trace near its junction with tin second root. The apical cell of the latter was readily seen and appears in longitudinal section of nearly triangular form, but with the base somewhat truncate (fig. 177, C). The tracheaiy tissue in the middle of the sporophyte is pretty will advanced and the formation of the tracheaiy tissue has extended for some distance into the primary root and the cotyledon. In the former a single elongated tannin sac could. 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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