. Comparative morphology of Fungi. Fungi. PEZIZALES 333 number of female nuclei in each ascogonium always reaches several hundred. The male nuclei group into a thick protoplasmic mass in the vicinity of the tip of the trichogyne; the separating membrane is dissolved and they migrate into the trichogyne (Fig. 220, 3). Mean- while, the female nuclei in the ascogonium have been united to a central hollow sphere, the septum in the trichogyne neck is temporarily dissolved, the male nuclei migrate into the ascogonium and there, for the most part, pair with the somewhat larger female nuclei. ...anth
. Comparative morphology of Fungi. Fungi. PEZIZALES 333 number of female nuclei in each ascogonium always reaches several hundred. The male nuclei group into a thick protoplasmic mass in the vicinity of the tip of the trichogyne; the separating membrane is dissolved and they migrate into the trichogyne (Fig. 220, 3). Mean- while, the female nuclei in the ascogonium have been united to a central hollow sphere, the septum in the trichogyne neck is temporarily dissolved, the male nuclei migrate into the ascogonium and there, for the most part, pair with the somewhat larger female nuclei. ...anth an,. Fig. 220.—Development of sexual organs of Pyronema confluens. 1. Tuft of ascogonia, ascg, with trychogyne, tr, and antheridia, anth; P, sterile hyphae. 2. The nuclei of the trichogyne degenerate; the antheridium is in open communication with the trichogyne. 3. The male nuclei migrate into the trichogyne; P, sterile hyphae which will develop the paraphyses. 4. The basal wall of the trichogyne disappears, the male nuclei migrate into the ascogonium which is already beginning to produce ascogenous hyphae, asc. h. 5. The basal wall of the trichogyne again formed; nuclear pairing is completed and several dicaryons have migrated into the ascogenous hyphae. (After Harper, 1900.) After a few hours, ten to twenty ascogenous hyphae grow out of the ascogonium and take up the dicaryons (Fig. 220, 5). They branch very much and the dicaryons increase by conjugate division (Fig. 221, 1) Finally the ascogenous hyphae are broken up by septa so that two to eight dicaryons are present in the vicinity of the ascogonium, and at a distance from it, only one is present (Fig. 221, 2). Which nucleus of the pair is female and which is male is not determinable, as their size differ- ences have 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 r
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