. Comparative morphology of Fungi. Fungi. 180 COMPARATIVE MORPHOLOGY OF FUNGI in Aspergillus nidulans (Eidam, 1883; Dangeard, 1907), as in Eremascus, two equal copulation branches are formed; they coil around each other helically (Fig. 117, C) and apparently come into open communication at the tip. The content of one branch migrates into the other. Both copula- tion branches are then surrounded by a dense hyphal knot (Fig. 117 D), which subsequently assumes a plectenchymatous character. Thus in these forms antheridium and ascogonium are still equivalent and may be directly ranked with the equa
. Comparative morphology of Fungi. Fungi. 180 COMPARATIVE MORPHOLOGY OF FUNGI in Aspergillus nidulans (Eidam, 1883; Dangeard, 1907), as in Eremascus, two equal copulation branches are formed; they coil around each other helically (Fig. 117, C) and apparently come into open communication at the tip. The content of one branch migrates into the other. Both copula- tion branches are then surrounded by a dense hyphal knot (Fig. 117 D), which subsequently assumes a plectenchymatous character. Thus in these forms antheridium and ascogonium are still equivalent and may be directly ranked with the equally isogamous copulation branches of many Endomycetaceae and Gymnoascaceae. £0. Fig. —Penicillium vermiculatum. 1. The multinucleate ascogonium and young antheridium. 2. The antheridium is in open communication with the antheridium but the male nucleus remains in the antheridium. 3. The ascogonium surrounded by sterile hyphae is divided into binucleate cells which are beginning to develop ascogenous hyphae. (X 600; after Dangeard, 1907.) In a second group, which at present includes only Penicillium vermic- ulatum (Dangeard, 1907), the copulation branches, as in P. "crustaceum," are arranged regularly; however, they show a characteristic differentia- tion in their behavior. In this species the hyphae are always uninucleate. On the formation of the perithecium there appears, as a branch of any hypha, a unicellular ascogonium rich in protoplasm, which, like the other cells of the hypha, contains a single nucleus. It elongates rapidly and by repeated nuclear division becomes as much as 16-nucleate. Meanwhile there has appeared a second slender branch, the young antheridium. Generally it arises from a different hypha than that which bears 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 Gäu
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