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Xanthophyceae
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Tribonematales
Filamentous, coccoid, and capsoid forms, sometimes becoming parenchymatous or multinucleate with age; cell walls, when present, either with H-shaped overlapping cell wall pieces or with complete or entire cell walls; elaborate reproductive structures lacking. Botrydium, Bumilleriopsis, Characiopsis, Chloromeson, Heterococcus, Ophiocytium, Sphaerosorus, Tribonema, Xanthonema.
Vaucheriales
Siphonous filaments; elaborate sexual reproductive structures as antheridia and oogonia. Vaucheria.
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