Plasmodial slime mold life cycle
Haploid spores develop into amoeboid or flagellated forms, which are then fertilized to form a diploid, multinucleate mass called a plasmodium. This plasmodium is net-like and, upon maturation, forms a sporangium on top of a stalk. The sporangium forms haploid spores through meiosis, after which the spores disseminate, germinate, and begin the life cycle anew. The brightly-colored plasmodium in the inset photo is a single-celled, multinucleate mass.
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"OpenStax College, Groups of Protists. November 18, 2013."
http://cnx.org/content/m44617/latest/
OpenStax CNX
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