. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. IX FILICINE^ LEPTOSPORANCIAT^ 31S it arises from a protrusion of the cell which is cut off by a wall, which is usually somewhat oblique. The papilla thus formed enlarges and soon becomes almost hemispherical. It contains a good deal of chlorophyll and a large central nucleus sur- rounded by dense cytoplasm. The first wall in the young an- theridium (Fig. 174, A) is very peculiar. It has usually the form of a funnel, whose upper rim is in contact with the wall of. Fig. 174.—Onoclea struthiopten
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. IX FILICINE^ LEPTOSPORANCIAT^ 31S it arises from a protrusion of the cell which is cut off by a wall, which is usually somewhat oblique. The papilla thus formed enlarges and soon becomes almost hemispherical. It contains a good deal of chlorophyll and a large central nucleus sur- rounded by dense cytoplasm. The first wall in the young an- theridium (Fig. 174, A) is very peculiar. It has usually the form of a funnel, whose upper rim is in contact with the wall of. Fig. 174.—Onoclea struthiopten's. Development of the antheridium, A-C, Vertical section, x6oo; D, two nearly ripe sperm cells; E, free spermtatozoid, X about the antheridium cell, and whose base strikes the basal wall of the antheridium. Sometimes this first wall does not reach to the base, in which case it is simply more or less strongly concave, and the basal cell cut off by it from the antheridium is discoid instead of ring-shaped (Fig. 174, B). The second wall is hemispherical, and is nearly concentric with the outer wall of the antheridium. The dome-shaped central cell produces the. 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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