Conjugation in Zygnemataceae: Mougeotia
Progressive development of geniculations ('knee bends') associated with lateral conjugation: this may be Mougeotia geniculata. The cell diameter is 32Ám.
a c f
These two pictures show the short rhizoid-like branches which grow out from one filament to make contact with another (not always successfully):
side braches reach several cells in length
Cell contents change their appearance: the chloroplast contracts and becomes more dense, contracting away from the other organelles
A general view of the filaments: