. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. Vlll MARATTIALES 29S this condition is due to a coalescence of originally separate cells, or what seems more likely, arises simply from nuclear division in the young tapetal cells, without the formation of cell walls, was not decided. The young spore tetrads, at this time, are embedded in an apparently structureless mucilaginous matter, which stains uniformly with Bismarck-brown. This mucilage apparently is secreted by the tapetal cells for the nourishment of the spores. Bower (17) has recentl
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. Vlll MARATTIALES 29S this condition is due to a coalescence of originally separate cells, or what seems more likely, arises simply from nuclear division in the young tapetal cells, without the formation of cell walls, was not decided. The young spore tetrads, at this time, are embedded in an apparently structureless mucilaginous matter, which stains uniformly with Bismarck-brown. This mucilage apparently is secreted by the tapetal cells for the nourishment of the spores. Bower (17) has recently made a very complete study of the development of the sporangium in all the genera except. Fig. 166.—^A, Transverse section of three synangia of Dancea alata^ X15; B, horizontal section of a synangium, showing the numerous loculi, Xis; C, vertical; D, hori- zontal section of a synangium of Kaulfussia (EsculifoUa, X15. (C, D, after Bower.) Archangiopteris. He finds in all of them that the sporogenous tissue of each sporangium (or loculus), can usually be traced to a single mother-cell, although there may be exceptions to this rule. In all cases the tapetum arises from the tissue adjacent to the archesporium, and not from the outer cells of the sporog- enous complex. In this respect the Marattiaceas resemble more nearly Helminthostachys or Botrychium than they do Ophio- glossum. In Dancea and Kaulfussia there is no mechanical tissue rep- resenting an annulus. The dehiscence is accomplished by a. 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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