Conjugation in Zygnemataceae: Mougeotia

Progressive development of geniculations ('knee bends') associated with lateral conjugation: this may be Mougeotia geniculata. The cell diameter is 32Ám.

d e b

a c f

19 23


These two pictures show the short rhizoid-like branches which grow out from one filament to make contact with another (not always successfully):

g h

n o

Sometimes the side braches reach several cells in length
12


Cell contents change their appearance: the chloroplast contracts and becomes more dense, contracting away from the other organelles

10   v
18

A general view of the filaments:

17

The organelle which appears to have subunits is a pyrenoid (starch storage body)
3

1
The bulge in the cell wall grows until it develops into a tube: when the end opens the spore escapes:
4

5

6

7

8

9

11

25

13  14

15  20

21  28

22

24  26

27

[snaps]  [contents]

John Kinross