. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. XIII LYCOPODINE^ 529 chyma of the stem the chloroplasts are apparently of the ordi- nary form, but a careful examination shovvfs that they are all connected, and are directly referable to the divisions of the primary plastid in the young cell. In all cases the nucleus is in contact with the chloroplast or group of chloroplasts (Fig. 306). The character of the chloroplasts here has its nearest analogy in Anthoceros, where occasionally a division of the chloroplasts is met with, especially in th
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. XIII LYCOPODINE^ 529 chyma of the stem the chloroplasts are apparently of the ordi- nary form, but a careful examination shovvfs that they are all connected, and are directly referable to the divisions of the primary plastid in the young cell. In all cases the nucleus is in contact with the chloroplast or group of chloroplasts (Fig. 306). The character of the chloroplasts here has its nearest analogy in Anthoceros, where occasionally a division of the chloroplasts is met with, especially in the elongated cells of the sporogonium. cl--. FiG. 306.—A, B, Cells of the mesophyll of Selaginella Martensii showing the single chloroplast (cl) and the nucleus (n) ; C, chain of connected oval chloroplasts from the inner cortex of the stem of S. Kraussiana, X640 (after Haberlandt). The Roots The roots in S. Kraussiana are borne upon the special leaf- less branches or rhizophores, which in structure are much Hke the stem. Previous to the formation of the first roots upon the rhizophore (Sadebeck (6) ), the apical cell is obliterated and re- placed by a group of initial cells. The apical cells 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 Campbell, Douglas Houghton, 1859-1953. New York, The Macmillan Company;
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