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SUMMARY An ultrastructural study of motile cell development in the green algaTrentepohlia aureahas revealed the presence of multilayered structures (MLS) associated With flagellar bases. These MLS are ultrastructurally similar to MLS described in pteridophyte and bryophyte sperm and in the zoospore of the green algaeColeochaeteandKlebsormidium.However, 2 MLS are found in each biflagellate motile cell ofT. aurea, while other previously described MLS occur singly in biflagellate motile cells. In addition, the MLS ofT. aureaconsist of fewer microtubules and are structurally simpler than most other MLS described. The MLS ofTrentepohliamay represent a stage in the evolutionary development of the MLS of land plants. The presence or absence of the MLS in motile cells of green algae may be a useful character in phylogenetic studies.
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Graham et al. (1975) studied this question.
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