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| Description: (a) When a mycelium, such as that of Rhizoctonia solani, is surrounded by food substrate in a liquid medium, it will grow into a spherical form. (b) When the food supply is limited to a two-dimensional supply, as shown by Neotestudina rosatii in the Petri dish shown here, the mycelium will form a disk. Likewise, distribution of the food substrate determines the mycelium shape in nature.
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