Defining Characteristics

  • Colony forming? No
  • Filamentous? Yes
  • Mat-forming
  • Isopolar filaments
  • Cells are ~3-15um wide
  • Cells always longer than wide
  • Sheath always present
  • Aerotopes, heterocysts and akinetes absent
  • Could be confused with: Geitlerinema, Tychonema

Phormidium

Phormidium

Phormidium

Phormidium