. Carnegie Institution of Washington publication. THE YOUNG SPOROPHYTE 149 The cotyledon in Kaulfussia (fig. 123) is spatulate in form and not unlike that of Daneea in shape and also closely resembles in outline the broader leaf forms of Ophioglossum moluccanum. The resemblance to the latter is much increased by the venation, which is reticulate and extraordinarily like that of the cotyledon of Ophioglossum. As in Ophioglossum, there is usually a mid-vein, but this is not, however, noticeably thicker than the laterals. The latter, instead of extending free to the edge of the leaf, are connecte
. Carnegie Institution of Washington publication. THE YOUNG SPOROPHYTE 149 The cotyledon in Kaulfussia (fig. 123) is spatulate in form and not unlike that of Daneea in shape and also closely resembles in outline the broader leaf forms of Ophioglossum moluccanum. The resemblance to the latter is much increased by the venation, which is reticulate and extraordinarily like that of the cotyledon of Ophioglossum. As in Ophioglossum, there is usually a mid-vein, but this is not, however, noticeably thicker than the laterals. The latter, instead of extending free to the edge of the leaf, are connected at their distal ends with the mid-vein so as to inclose more or less elongated areoles. The central vein does not extend to the tip but, as in Datura, divides into equal branches which join above so as to inclose. a fi 127. A. Lamina of young cotyledon of Marattia douglasii. B. Section of lamina of cotvledon. X300. X260. a terminal areole. A careful examination of the secondary veins shows that their divisions are really dichotomous, as in the lateral veins of the other Marattiacea?, and some of the ultimate branches may reach the margin of the leaf, or more rarely they may end freely within the areoles. As the cotyledon develops there is more or less elongation of the petiole, which, however, very seldom exceeds the lamina in length. The petiole is usually more or less deeply channeled upon its inner face. In Marattia douglasii (fig. 133) the base of the cotyledon is much enlarged just above the level of the stem apex, which is. 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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