. Carnegie Institution of Washington publication. *^ Y-v£*«^*-i -;w •. i?a ^«i,?;*:^f E. FIG. 42.—Copulation of sexual organs of Pyronema.—(After Harper.) D, the trichogyne has copulated with antheridium, nuclei in trichogyne disintegrated ; hypothecial hyphae springing from stalk cells. E, trichogyne filled with nuclei from antheridium ; antheridium curved around trichogyne so that the latter appears in section to cut through it; trichogyne still separated from oogonium by transverse wall. become collected into a dense, hollow sphere, equal in diameter to about half that of the oogonium, or t
. Carnegie Institution of Washington publication. *^ Y-v£*«^*-i -;w •. i?a ^«i,?;*:^f E. FIG. 42.—Copulation of sexual organs of Pyronema.—(After Harper.) D, the trichogyne has copulated with antheridium, nuclei in trichogyne disintegrated ; hypothecial hyphae springing from stalk cells. E, trichogyne filled with nuclei from antheridium ; antheridium curved around trichogyne so that the latter appears in section to cut through it; trichogyne still separated from oogonium by transverse wall. become collected into a dense, hollow sphere, equal in diameter to about half that of the oogonium, or they may aggregate into an irreg- ular, crescent-shaped mass in either the upper or lower half of the oogonium (Fig. 42, E). Less frequently several masses of nuclei are formed instead of one. The cytoplasm of the oogonium, which was charged with densely staining substances, becomes tenuous and loosely spongy in texture. After the oogonial nuclei have aggregated in the center of the egg-cell, the basal wall of the trichogyne breaks down and the antheridial nuclei. 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1900, bookyear1904
