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The nuclei of the plasmodial phase of the true slime mold (myxomycetes) perform intranuclear mitosis which is not accompanied by centrioles, while those of the myxamoebae exhibit an astral type of mitosis with centrioles and nuclear envelope breakdown (2) . In fungal mitoses of centriole-lacking styles, the microtubules composing the metaphase spindle arise, in most instances, in the vicinity of variously shaped microtubule organizing centers (MTOC) (13) or spindle pole bodies (1) . These may take the form of circular or rectangular, electron-opaque, layered plaques as in yeasts and mycelial ascomycetes (14, 17), or vaguely textured spherical structures repeatedly described in basidiomycetes (5, 10, 11) . No such structure has been described in myxomycetes but recently one has been found, surprisingly, deep inside prophase nuclei of Physarum (15) . The present study provides independently made observations confirming the occurrence of this novel type of MTOC in Physarum .

INTRANUCLEAR MICROTUBULE ORGANIZING CENTER IN EARLY PROPHASE NUCLEI OF THE PLASMODIUM OF THE SLIME MOLD, PHYSARUM POLYCEPHALUM