. Experiments with plants. Botany. •ifli; EXPEBIMl-jyTS WITff Tln' Spores of the Mould are (like the spores of the bacteria) resistant cells which are not injured by exposure to dry air and are, in fact, carried about by the wind so as to s<'atter the Mould everywhere. When ripe the spore-case bursts, so as to set the spores fi'ee. In addition to these spores (called asexual spores) there often occur lrii\c:er ones (called sexual spores, or zygospores, because they result from the union of two branches), which are formed, as shown in Fig. 2'20, by two branches coming together and fu
. Experiments with plants. Botany. •ifli; EXPEBIMl-jyTS WITff Tln' Spores of the Mould are (like the spores of the bacteria) resistant cells which are not injured by exposure to dry air and are, in fact, carried about by the wind so as to s<'atter the Mould everywhere. When ripe the spore-case bursts, so as to set the spores fi'ee. In addition to these spores (called asexual spores) there often occur lrii\c:er ones (called sexual spores, or zygospores, because they result from the union of two branches), which are formed, as shown in Fig. 2'20, by two branches coming together and fu- sing so as to form a large, thick-walled spore of a deep black color. These spores are larger, more resistant, contain moi-e nutriment and give rise on germination to a more vigorous growth than the ordinary asexual spores. Another very connnon Mould is the Oreen Mould (I'enicillium) of che<_^se, bread, jellies, etc. In this ^lould the spores are in long chains at the end of the stalk (Fig. ^^1), and are not enclosed in a spore-case, as in the Black Mould. What effect do these Moulds have on the substances. 220. Formation of zygospores of the Blaok .Mould of loi-inl: iit the left two branches touching. ti> tlie riglit stages in the fu- sion, tlie lieing the fully formed zygo- 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 Osterhout, Winthrop John Van Leuven, 1871-. New York, The Macmillan company; London, Macmillan & co. , ltd.
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