These Closterium algae are elongate desmids formed by two hemicells that are mirror images of each other. Although there is only a single central nucleus, each semicell has one or two axial, ridged chloroplasts with at least one pyrenoid. Closterium cell walls have pores to secrete mucilage. Cells are only slightly constricted in the middle compared to other placoderms.
B0007287. Wellcome Images available under the following creative commons usage http://creativecommons.org/licenses/by-nc-nd/2.0/uk/ Additional reference: Encyclopedia of Life http://eol.org/pages/11646/overview
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