. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 452. MOSSES AND FERNS cells, which here are much longer than the others. It subse- quently divides by a transverse wall, as may happen in the Marattiacese and occasionally in Osmunda, but whether this alvi^ays takes place is not certain (Fig. 263, A). The four rows of neck cells are all alike, and consist ordinarily of three cells. Fig. 263.—A, Longitudinal section of nearly ripe archegonium, with two neck canal cells ic, 1,^ Xs5o; B, section of an open archegonium, X27S; C, D, two cross- sect
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 452. MOSSES AND FERNS cells, which here are much longer than the others. It subse- quently divides by a transverse wall, as may happen in the Marattiacese and occasionally in Osmunda, but whether this alvi^ays takes place is not certain (Fig. 263, A). The four rows of neck cells are all alike, and consist ordinarily of three cells. Fig. 263.—A, Longitudinal section of nearly ripe archegonium, with two neck canal cells ic, 1,^ Xs5o; B, section of an open archegonium, X27S; C, D, two cross- sections of a young archegonium; L, the lobe at the base of which the arche- gonium is formed, X550, each, the terminal ones being very long, and when the archego- nium opens bending back strongly, but not becoming detached. The central cell is surrounded by a single layer of tabular cells cut off from the adjacent prothallium tissue, but these divisions may extend to the lower neck cells (Fig. 263, A). The ^gg is globular and shows no peculiarities of structure. Buchtien's ((i), p. 24) account of the further development of the mer- istem, as well as his figures, point to something very much like a repeated dichotomy of the growing point; a further investiga-i. 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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