. Carnegie Institution of Washington publication. 46 111 I OPHIOGLOSSALES in the mid-region of the sporoph) te (fig. i~, C), the only difference noted is a slightly greater development of the xylem. I In- section of the root (fig. 27, D) presents almost exactly the same appearance as that of the leaf. Whether we should call the root bundle "monarch" or "collateral" is merely a question of terms. In the mid- region the endodermis can he clearly seen, and it is then evident that the xvlem is separated from it by a single layer of pericycle Fig. 28. A. Archcgonium of B
. Carnegie Institution of Washington publication. 46 111 I OPHIOGLOSSALES in the mid-region of the sporoph) te (fig. i~, C), the only difference noted is a slightly greater development of the xylem. I In- section of the root (fig. 27, D) presents almost exactly the same appearance as that of the leaf. Whether we should call the root bundle "monarch" or "collateral" is merely a question of terms. In the mid- region the endodermis can he clearly seen, and it is then evident that the xvlem is separated from it by a single layer of pericycle Fig. 28. A. Archcgonium of Botrychium virginianum, containing a two-celled embryo. X275. B. Four longitudinal sections of an embryo with 7 cells. X275. THE EMBRYO OF BOTRYCHIUM. The following account of the development of the embryo of Botrychium is based mainly upon material of B. virginianum furnished me through the kindness of Professor Jeffrey. In this species, as in the other Eusporangiatae, there is a marked increase in the size of the fertilized ovum before the first division takes place. At the time of the. 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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