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Diversity of Viruses, Bacteria and Fungi, During the favourable condition of growth and nutrition the asexual, reproduction takes place by conidiophores. At the time of asexual reproduction, from the mycelium arise stout, erect and aseptate conidiophores. The free end of, the conidiophore swells up into a vesicle, Numerous small and bottle shaped, hyphae outgrowth the Sterigmata are budded out from the vesicle and covers its, entire surface. Several nuclei form conidiospore pass into sterigmata. The, sterigmata may be branched or unbranched and may also form secondary, sterigmata Each sterigmatan buds off a chain of conidia in basigenous manner,, thus the oldest conidium is farthest to sterigma in position and youngest is at the, nearest position. Each conidium or conidiospore is a small, oval, greenish; uni or, multinucleate structure. On reaching maturity the conidia or conidiospores are, disseminated by air. On reaching a suitable substratum, the spore germinates to, form a hyphae which develop into fresh mycelium., 3. Sexual reproduction :, The sexual reproduction is rather rare and takes place under favourable, conditions. The sex organs are produced on the same mycelium which has, produced conidia. The male organs called as antheridium or pollinodium and, the female as archicarp or ascogonium., The ascogonium or archicarp (female reproductive organ) develops as a, branch of hyphae. This branch is coiled and the coils are loose in beginning but, later come closer. Septa are formed and each cell becomes multinucleate. The, apical segment is called as trichogyne, the next one oogonium and the lower, septate part is called stalk., YOUNG SEXORGANS, ANTHERIDIUM, PERIDIUM, PERIDIUM, TRICHOGYNE, ARTHERIDIUM, ASCUS, COILED, ARCHICARP, STERILE, HYPHAE, ASCOGENOUS, HYPHAE, ASCOSPORES, ASCUS, ASCO SPORES, Fig. 57. Scxual reproduction in Aspergillus.