. Carnegie Institution of Washington publication. ALBUGO (CYSTOPUS) . 97 structure seem not unlike those of higher plants. The number of nuclei in the young oogonium, at this stage, varies with its size, the average being from 70 to no. The antheridium, containing from 6. FIG. 35.—Development of sexual organs and fecundation \nAlbugo (Cystopus) Candida.—(After Wager.) A, antheridium attached to wall of oogonium, just beginning to push out its conjugating tube; dense mass of cytoplasm and several nuclei seen near projection. B, young oogonium after its delimination from mycelium, with antheridi
. Carnegie Institution of Washington publication. ALBUGO (CYSTOPUS) . 97 structure seem not unlike those of higher plants. The number of nuclei in the young oogonium, at this stage, varies with its size, the average being from 70 to no. The antheridium, containing from 6. FIG. 35.—Development of sexual organs and fecundation \nAlbugo (Cystopus) Candida.—(After Wager.) A, antheridium attached to wall of oogonium, just beginning to push out its conjugating tube; dense mass of cytoplasm and several nuclei seen near projection. B, young oogonium after its delimination from mycelium, with antheridium attached ; receptive papilla projects from oogonium toward antheridium ; nuclei seem to be entering prophase of division. C, later stage; protoplasm has contracted into a large central mass ; nearly all the nuclei have divided, and are collecting at periphery of central mass ; the deeply stained mass of cytoplasm, a (central body, coenocentrum), is seen in center in contact with egg-nucleus; egg-nucleus is derived from one of the original nuclei of oogonium. D, oogonium into which conjugating tube has penetrated ; differentiation of periplasm and ooplasm becoming apparent, though a plasma membrane has not been formed around the egg; in center of ooplasm is the egg-nucleus near the dense mass of cytoplasm; in end of conjugating-tube is dense cytoplasm in which lies the male nucleus. E, later stage than D ; apical wall of conjugating tube, becoming very thin ; plasma membrane of ogg not yet formed. to 12 nuclei, now applies itself to the oogonium. The structure both of its nuclei and cytoplasm is similar to that of the oogonium. Soon after the two organs come into contact with each other, a portion. 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
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