The Occurrence of Binary Plasmotomy in the Protoplasmodium of the White-Spored Echinostelium minutum

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Abstract
The developmental cycle of the white-spored form of the myxomycete E. minutum consists of 2 alternating trophic phases: a uninucleate amoeboid cell (myxamoeba or swarm cell) and a microscopic, multinucleate protoplasmodium. Once formed a protoplasmodium of this species multiplies by separation into 2 daughter plasmodia (binary plasmotomy), a circumstance unique among myxomycetes. The contention that protoplasmodia of E. minutum divide by binary plasmotomy was documented cytologically.