Thallus: The body of a plant which is not differentiated into stem, root and leaf.
Thermocline: Depth zone within which temperature changes maximally.
The forms growing in bright light or the partly emersed forms have a >wider thallus and are brighter green in color; sometimes they are mistaken >for other species. .....
Figure 10 + 11: Three sporangia have grown from the thallus of a Derbesia sporophyte. Note that the middle sporangium is immature and light green while the two others are mature and darker. The right sporangium has the cell membrane expanded.
Micropropagation or Tissue culture is when plants are propagated in a sterile environment using just part of the plant like the meristematic region or the undifferentiated prothallus of a fern.
 See also: Aquarium, Plants, Fish, Temperature, Micro
  
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