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Trebouxiophyceae
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Unconspicous
freshwater algae with some celebrities
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Metacentric
spindles: centrioles not at nuclear poles
but at the side of the spindle
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Appearance
from unflagellated, coccoid cells to filaments and bladelike thalli
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Chlorella:
2-12 µm, coccoid cells; known as phycobiont (endosymbiont) in freshwater
animals; used as model by Melvin Calvin to investigate carbon fixation
in plants (Calvin cycle); recent research in Chlorella phytoviruses
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Prototheca:
colorless soil algae, plastids can be stained by iodine; pathogene of
animals and humans
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Trebouxia
is the major chlorophyte symbiont in lichens
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Stichococcus:
2-3 µm rod-shaped cells, lichen symbiont
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Golenkinia:
Chlorella-like cells with long spines; asexual reproduction by 2-8
autospores, sexual reproduction by oogamy
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Prasiola:
single-layered blades, 1.5 cm, attached to rocks, predominantly in Antarctica
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