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The circular shape of a fungus spot is due to the concentric growth of the hyphae outwards from the central germinated spore or conidia.Growth may also occur downwards into the substrate.Hyphae may force themselves between fibres by secreting enzymes which digest the amorphous material be-tween fibres,such as the... 顯示更多 The circular shape of a fungus spot is due to the concentric growth of the hyphae outwards from the central germinated spore or conidia.Growth may also occur downwards into the substrate.Hyphae may force themselves between fibres by secreting enzymes which digest the amorphous material be-tween fibres,such as the grounds in paper,or digest the fibres themselves and then absorb the digested substrate.Informa-tive illustrations are shown in the article by Szczpanowska(1986).
Under adverse environmental conditions some fungi species produce sclerotia which look like black fly spots in the fungal stain.Sclerotia are made up of an organized mass of pigmented hyphae and stored nutrients. They function in vegetative propagation.
For further information,see Cole and Kendrick(1981)and Smith and Berry(1975).
REFERENCES
Burnett,J.H.1976.Fundamentals in Mycology,2nd edition,Edward
Arnold(Publishers)Ltd,London.
Cole,G.T.and B. Kendrick. 1981.Biology of Conidial Fungi, Vol.1.
Academic Press,New York.
Smith,J.E. and D.R. Berry.1975. Filamentous Fungi. Vols 1, 2 and 3.
Wiley,New York.
Szczepanowska,H.1986.Biodeterioration of art objects on paper.The
Paper Conservator,10:31-39.
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