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Members of the Closterium peracerosum–strigosum–littorale (C. psl.) complex are unicellular charophycean algae in which there are two modes of zygospore formation, heterothallic and homothallic. A homothallic strain of Closterium (designation, kodama20) was isolated from a Japanese rice paddy field. Based on alignment of the 1506 group‐I introns, which interrupt nuclear SSU rDNAs, homothallic kodama20...