Science for beginners . u can find them growing on. If you select the commongreen mold, Penicillium, for example, you should find it growing011 a great variety of different substances (Fig. 193). Cheese, curedmeats, stale bread, old clothing, old shoes, indeed, almost any kindof plant or animal matter may afford food for this mold. Notethat the general appearance of a given mold varies considerablyas it grows in different situations. 294. Conditions Which Favor Mold Growth.—If we are to be successful in warding off the attacks which molds make onthe things which we wish to preserve, we must un
Science for beginners . u can find them growing on. If you select the commongreen mold, Penicillium, for example, you should find it growing011 a great variety of different substances (Fig. 193). Cheese, curedmeats, stale bread, old clothing, old shoes, indeed, almost any kindof plant or animal matter may afford food for this mold. Notethat the general appearance of a given mold varies considerablyas it grows in different situations. 294. Conditions Which Favor Mold Growth.—If we are to be successful in warding off the attacks which molds make onthe things which we wish to preserve, we must understand theconditions which are favorable for mold growth. Everyoneis familiar with the fact that molds do not grow on materialswhich are quite dry. One of the earliest methods which manever devised for the preservation of food is that of drying certain amount of moisture must be present before moldscan grow at all and a considerable amount is necessary for aluxuriant growth. When there is barely enough moisture. 268 MICROORGANISMS present in a given material to support a mold growth, themycelium development is very slight and there is little visibleevidence of the presence of the mold except the spores. Thespores are borne on very short sporophores and present apowdery appearance over the surface of the substratum. Itis common to speak of mold when it presents this appearance as mildew. Mildew is simplymold which has grown on ascant moisture supply. Duringmost of the year, the out door airand the air in houses is relative-ly dry. Consequently, dry ob-jects in this air are too dry forthe growth of molds. In theFig. 194.—Antenaria. Note da gult weather of the how differently it bears its . _ n . spores when compared with summer time, however, the airmucor, aspergillus, or peni- sometimes becomes so damp as to give sufficient moisture to dryobjects, such as clothing, carpets, and the like, to permit agrowth of mold on these materials. Clothing hung in closed closets and
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