A taxonomic study of two Stichococcus species (Trebouxiophyceae, Chlorophyta) with a starch-enveloped pyrenoid
We investigated the morphology, ultrastructure and 18S rDNA molecular phylogeny of a green algal strain previously described as Klebsormidium marinum and a similar new strain isolated from Southeast Asia. Ultrastructural features and molecular phylogenetic analyses revealed that the two strains are unrelated to the charophycean genus Klebsormidium and belong to the trebouxiophycean genus Stichococcus, despite the presence of a pyrenoid with a conspicuous starch envelope. The two strains are indistinguishable at the ultrastructural level, but only one strain forms filaments of 4-10 cells on solid medium. The 18S rDNA sequences indicate that the strains represent separate species. We propose the two strains be classified as Stichococcus deasonii nomen novum and Stichococcus jenerensis species nova, respectively.
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Document Type: Research Article
Publication date: 01 February 2007
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- Nova Hedwigia is an international journal publishing original, peer-reviewed papers on current issues of taxonomy, morphology, ultrastructure and ecology of all groups of cryptogamic plants, including cyanophytes/cyanobacteria and fungi. The half-tone plates in Nova Hedwigia are known for their high quality, which makes them especially suitable for the reproduction of photomicrographs and scanning and transmission electron micrographs.
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