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Physarum (class Myxomycetes) A large genus of slime moulds, including P. polycephalum, which can be cultivated and induced to fruit under laboratory conditions. This species forms a conspicuous yellow plasmodium which gives rise to clusters of stalked yellowish or grey sporangia. P. polycephalum is found on dead wood and on fleshy fungi. It is distributed widely in the USA and has been reported from other countries, including France and Japan.

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