Sphaeroplea Fragilis
''Sphaeroplea'' is a genus of green algae in the family Sphaeropleaceae. It was first circumscribed by the Swedish botanist Carl Adolph Agardh in 1824. Description ''Sphaeroplea'' consists of unbranched filaments of cells, one cell thick. Cells are usually 10–50 μm in diameter, but one variety can reach up to 170 μm in diameter. Cells are cylindrical, several times longer than wide, with a linear series of alternating vacuoles and cytoplasmic zones containing nuclei and chloroplasts. The chloroplasts are band-shaped, and contain several pyrenoids. Nuclei are typically in pairs. Reproduction ''Sphaeroplea'' reproduces asexual reproduction, asexually and sexually. In asexual reproduction, the filaments break apart, although one species has been observed to produce zoospores that are biflagellate (i.e. with two flagella). Sexual reproduction is typically oogamous, where vegetative cells become reproductive cells without changing their shape. Female gametes are large, spherical a ...
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