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  • 1
    ISSN: 1615-6102
    Keywords: Fungus ; Physoderma ; Rhizomycelium ; Sporangium development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The endobiotic thallus ofPhysoderma maydis is characterized by the presence of an extremely fine rhizomycelium which passes through the host cell wall, allowing the spread of the disease, and irregularly shaped “turbinate cells”, which may be septate or nonseptate and which are in close association with developing resting sporangia. The formation of the resting sporangium wall is first seen as localized depositions on the rounded surface of the sporangium and only later on the flattened surface of the sporangium which will form the operculum. The substructure of the resting sporangium wall is typical for members of theBlastocladiales. The resting sporangium is contiguous with the rhizomycelium during development and is finally sealed-off from the rhizomycelium by a further deposition of wall material. After the sealing-off of the resting sporangium from the rhizomycelium the content of the sporangium is compartmentalized and the two inner wall layers are deposited. The centre of the sporangium is filled with an electron dense accretion. At the periphery of the sporangium is a layer of lipid bodies. Between the lipid bodies and the central electron dense accretion is a thin layer of cytoplasm which contains the nuclei. The outer surface of the resting sporangium is smooth.
    Type of Medium: Electronic Resource
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