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• Identification of algae »
• Freshwater algae »
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• Identification guide »
• Colonial »
• Cell contents (chloroplasts when present) are green or blue-green »
• Cells contain membrane-bound organelles (chloroplasts, nuclei etc) and cell contents are grass green »
• Cells long and thin, with tapering ends

Cells long and thin, with tapering ends

• 
  Long, spindle-shaped cells tapering to sharp points, weakly to strongly curved, row of pyrenoids absent; may cluster together in bundles.
  Ankistrodesmus
• 
  Cells spindle-shaped to cigar-shaped, arranged in roughly parallel clusters of 4, in a faint mucilage envelope.
  Quadrigula
• 
  Cells cigar-shaped, arranged in star-shaped colonies.
  Actinastrum