. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. THE JUNGERMANNIALES 93 off alternately right and left, and from each segment an arche^ gonium develops. The segment is first divided, probably, as in the male branch and the vegetative ones, into an inner and an outer cell, but I did not succeed in getting satisfactory longi- tudinal sections parallel to the surface, so cannot speak posi- tively on this point. The youngest segment, in which the archegonium mother cell is recognisable, shoves in vertical sec- tion three cells, a small ventral o
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. THE JUNGERMANNIALES 93 off alternately right and left, and from each segment an arche^ gonium develops. The segment is first divided, probably, as in the male branch and the vegetative ones, into an inner and an outer cell, but I did not succeed in getting satisfactory longi- tudinal sections parallel to the surface, so cannot speak posi- tively on this point. The youngest segment, in which the archegonium mother cell is recognisable, shoves in vertical sec- tion three cells, a small ventral one, a middle larger one, and a dorsal one—the archegonium mother cell. The latter does not form any stalk, but divides at once by the three intersect- ing walls, as in other Hepaticae, and the further development corresponds with these, except that the base of the archegonium. 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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