. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. nt THE JUNGERMANNIALES 97 brought about by a periclinal wall in each of the four termifial cells, dividing each into an inner archesporial cell, and an outer wall-cell. (Fig. 47, D.) The capsule wall in Fossombronia is two cells in thickness, except at the apex, where it may be three cells thick. The inner layer of cells, when the capsule is ripe, have irregular thickened bars developed upon the surface of the radial cell- walls. The development of the sporogonium is best known in Pellia epiph
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. nt THE JUNGERMANNIALES 97 brought about by a periclinal wall in each of the four termifial cells, dividing each into an inner archesporial cell, and an outer wall-cell. (Fig. 47, D.) The capsule wall in Fossombronia is two cells in thickness, except at the apex, where it may be three cells thick. The inner layer of cells, when the capsule is ripe, have irregular thickened bars developed upon the surface of the radial cell- walls. The development of the sporogonium is best known in Pellia epiphylla (Kienitz-Gerloff (i), Hofmeister (i) ). Here the first wall, as in Aneura, separates a lower cell, which sim- ply forms an appendage, from the upper cell, from which the. Fig. 47.—Fossombronia longiseta. Development of the embryo, XS^S; B, E, cross- sections; D, shows one of the primary archesporial cells. Figures drawn by Mr. H. B. Humphrey. stalk and capsule develop. In the latter the first wall is ver* tical, and is followed in each of the resulting cells by horizontal walls, by which the separation of the capsule from the seta is efifected. These four cells are now divided by vertical walls, so that two layers of four cells each are present. The first periclinal walls in the apical group of cells separate the arch- esporium from the wall of the capsule. 7. 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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