This is a preview. Log in through your library . Abstract • Background and Aims Penium margaritaceum is a unicellular charophycean green alga with a unique bi-directional polar expansion mechanism ...
Around 470 million years ago, land plants evolved from a charophycean algal ancestor. Many of their lineages, such as Sporogonites, Cooksonia and Baragwanathia (shown here), became extinct, while ...
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