. Carnegie Institution of Washington publication. u: I ll l MARATTIALES THE EMBRYO F l)\\ I \. Brebnei (Brebnei 2) h;is described the oldei embryo oi Datieea simplicifolta, but did not secure the earlier stages. 1 he youngest specimens he figures closely resemble in form a corresponding stage in the species studied by me, and the slightly pointed basal region suggests the possibility of the presence of a short suspensor in D. simplicifolia like that which I have found in D. jamaicensis and D. elliptica. While my own collection of young embryos is not as complete as might be wished, still enoug
. Carnegie Institution of Washington publication. u: I ll l MARATTIALES THE EMBRYO F l)\\ I \. Brebnei (Brebnei 2) h;is described the oldei embryo oi Datieea simplicifolta, but did not secure the earlier stages. 1 he youngest specimens he figures closely resemble in form a corresponding stage in the species studied by me, and the slightly pointed basal region suggests the possibility of the presence of a short suspensor in D. simplicifolia like that which I have found in D. jamaicensis and D. elliptica. While my own collection of young embryos is not as complete as might be wished, still enough stages wen secured to show that at least /). jamaicensis and D. elliptica. Fig. 114. Danaa jamaieenui A. Archegonium containing .1 one-celled embryo. B. Outline of next section of same embryo. C. Three-celled embryo, showing suspensor, ;. D. Outline of next section of tin- same embryo. Three longitudinal sections of a four-celled embryo, F. An older embryo, which was shrunken. O. Diagram of F, showing probable arrangement of cells. differ remarkably from the other Marattiaceae that have been studied in the develop- ment of a short suspensor, thus showing an interesting analogy with the embryo of Botrychium obliquum, described by Lyon (Lyon I). Whether D. jenmani shows the same peculiarity was not determined, on account of the failure to obtain the young embryo of this species; but as in its later development it corresponds very closely to the other species, it is highly probable that a suspensor 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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