. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. MUSCINEM—HEPA TIC X—MARCH ANTI ALES 45 One of the surface cells of the bottom of the receptacle projects as a papilla above the surface, and is cut off by a transverse wall from the cell below. The outer cell next divides again by a transverse wall into a lower cell, which develops no further, and a terminal cell from which the gemma is formed. This terminal cell first divides into two equal cells by a cross-wall (Fig. 13, B), and in each of these cells a similar wall arises, so that the young
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. MUSCINEM—HEPA TIC X—MARCH ANTI ALES 45 One of the surface cells of the bottom of the receptacle projects as a papilla above the surface, and is cut off by a transverse wall from the cell below. The outer cell next divides again by a transverse wall into a lower cell, which develops no further, and a terminal cell from which the gemma is formed. This terminal cell first divides into two equal cells by a cross-wall (Fig. 13, B), and in each of these cells a similar wall arises, so that the young gemma consists of four nearly. Fig. 13.—Marchantia polymorpha. A, Plant with gemma cups ik, k), X2; B-F, development of the gemmae, X525; G, an older gemma, X260; f, v', the two growing points. equal superimposed cells (Fig. 13, D). The wall III in Fig. 13, D, arises a little later than wall II, and is always more or less decidedty concave upward. Each of the four primary cells of the gemma is divided into two by a central vertical wall, and this is followed by periclinal walls in each of the resulting cells. At first the gemma is but one cell in thickness, but later walls are formed in the central cells parallel to the sur- face, so that it becomes lenticular. As it grows older there. 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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