. The essentials of botany. Botany. ZTQOPHYTA. 125 velop chloropnyll. The cell-walls are colorless, except in the fruiting hyphae, whicli are usually dark-colored or smoky (fuliginous); hence the name of Black Moulds. 264. The mycelium sometimes develops exclusively in the interior of the nutrient medium; in other cases, it de- velops partly in the medium and partly in the air. In some species the mycelium may occasionally attach itself to the hyphse of other plants of the same order, and even. Fio. 57.—Diagram showing the mode of growth of Mucor mucedo. m, the mycelium; s, single spore-case,
. The essentials of botany. Botany. ZTQOPHYTA. 125 velop chloropnyll. The cell-walls are colorless, except in the fruiting hyphae, whicli are usually dark-colored or smoky (fuliginous); hence the name of Black Moulds. 264. The mycelium sometimes develops exclusively in the interior of the nutrient medium; in other cases, it de- velops partly in the medium and partly in the air. In some species the mycelium may occasionally attach itself to the hyphse of other plants of the same order, and even. Fio. 57.—Diagram showing the mode of growth of Mucor mucedo. m, the mycelium; s, single spore-case, borne on an aerial erect hypha. to nearly related species, and derive nourishment parasiti- cally from them. It is douhtful, however, whether any species are entirely parasitic, and so far as parasitism oc- curs it appears to be confined to narrow limits; none, so far as known, are parasitic upon higher plants. 265. The reproduction of Black Moulds is asexual and sexual. In the asexual reproduction the mycelium sends up erect hyphse (Fig. 57), which produce few or many sepa- rable reproductive cells—the spores. The method of for- mation of the spores in the Black Mould of decaying 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 Bessey, Charles E. (Charles Edwin), 1845-1915. New York, Holt
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