Household bacteriology for students in domestic sciences / by Estelle D. Buchanan ... and Robert Earle Buchanan.

  • Buchanan, Estelle D. (Estelle Denis Fogel), 1876-
Date:
1913
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Licence: In copyright

Credit: Household bacteriology for students in domestic sciences / by Estelle D. Buchanan ... and Robert Earle Buchanan. Source: Wellcome Collection.

    86/570 page 66
    CHAPTER VIII CLASSIFICATION OF THE MOLDS Limitation of the Term Mold. — It is difficult, if not impossible, to formulate a wholly satisfactory definition for the term mold. It should be noted that the systematic botanist does not recog- nize any such group of fungi. The only justification for the use : of the term is an economic one, for the group contains many ! forms that are of importance in fermentation and in the preser- vation of food stuffs and other organic materials. It is a group made up of fungi having certain superficial resemblances. All of them are alike in possessing a plant body made up of hyphae; j most of them grow on a variety of dead organic matter, fre- | quently producing fermentation or decay, and a very few cause j disease in animals. Many diseases of plants are also caused by j closely related forms, but may be e.xcluded from consideration i; here, for they are of chief interest to the plant pathologist. In i] short, the group to be discussed is fairly well defined by the j common conception of molds as more or less cottony, cobwebby, j velvety, or powdery organisms occurring on decaying organic !; matter. !; Botanical Relationships of the Molds. — Organisms answering .! to the above general characterization of molds are found in three out of four of the main subdivisions of the fungi, namely, ] the Phycomycetes, Ascomycetes, and Fungi Impcrfecli (possibly the fourth, the Basidiomyceies, should be included also). A f- brief discussion of these groups follows: ; Phycomycetes. — These fungi are distinguished by possession ; of a non-septate or little septate mycelium and by producing sexual spores directly as the result of the union of two gametes.
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