Oscillatoria / Planktothrix

General Description

• Oscillatoria and Planktothrix are arranged as long, cylindrical filaments
• These filaments do not contain heterocysts. Sometimes, short vegetative segments of these can be seen, these are referred to as horomogones or trichomes
• Cells are rigidly divided and m ay or may not have a gelatinous sheath
• Planktothrix rubescence formerly known as Oscillatoria
• Colors vary from red, blue-green, yellow-brown, purple (some photos here are polarized and not the true color)