. The Eusporangiatae; the comparative morphology of the Ophioglossaceae and Marattiaceae. Ophioglossaceae; Marattiaceae. 98 THE OPHIOGLOSSALES The anatomy of O. simplex, so far as it has been investigated (see Bower 8) corresponds closely with that of the other species of the section Ophioderma. The roots of 0. pendulum also show the tetrahedral apical cell (fig. 67), but the divisions are much less regular than in O. moluccanum and probably the other species of the Euophioglossum. The segments divide slowly and increase a good deal in size before the first divi- sions take place, so that the
. The Eusporangiatae; the comparative morphology of the Ophioglossaceae and Marattiaceae. Ophioglossaceae; Marattiaceae. 98 THE OPHIOGLOSSALES The anatomy of O. simplex, so far as it has been investigated (see Bower 8) corresponds closely with that of the other species of the section Ophioderma. The roots of 0. pendulum also show the tetrahedral apical cell (fig. 67), but the divisions are much less regular than in O. moluccanum and probably the other species of the Euophioglossum. The segments divide slowly and increase a good deal in size before the first divi- sions take place, so that the youngest segments may equal the apical cell in size, and there is thus a certain resem- blance to the apical meristem in the root of the Marattiaceae. It is prob- able that, as in the Marattiaceae, the lateral segments of the apical cell also contribute to the root cap, which is rather better developed than it is in O. moluccanum. There is a good deal of difference in the structure of the root bundle (fig. 68). This is diarch in the primary root, as we have seen, and also in the smaller ones of older sporophytes; but in the larger roots, which may reach a diameter of over 3 millimeters, it is triarch; tetrarch bundles are also com- mon, and in one very large root which I examined the bundle was pentarch, but one of the xylem rays was shorter than the others, the xylem forming a solid central mass having the form of an irregular five-pointed Five specimens of 0. intermedium Hk., slightly reduced. C and D have a very much reduced 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 Campbell, Douglas Houghton, 1859-1953. Washington, D. C. , Carnegie Institution of Washington
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