In most cases, Azolla cristata has been called "Azolla caroliniana" in the hobby as well as in botanical literature. However, accoring to recent research, A. caroliniana is a synonym for Azolla filiculoides .
The very similar, easily-confused species A. cristata and A. filiculoides can best be discerned by microscopical characteristics of the female spores (megaspores). However, there are also some other distinguishing characteristics:
- the hairs on the upper side of the floating leaves consist of 2 or, less frequently, 3 cells (microscope!).
- The upper lobe of the floating leaf is almost sharp-tipped, with a narrow unpigmented membraneous margin (magnifying glass!).
- The sprouts have a more compact growth habit and lie flat on the water surface.
- The hairs on the upper side of the floating leaf consist of a single cell (mikroscope!).
- The upper lobe of the floating leaf is obtuse, with a relatively wide unpigmented membraneous margin (magnifying glass!).
- The sprouts grow more loosely, the shoot tips grow out of the water in most cases.
- To be continued -
|Dragon and Slate||
|Light||medium to high|
|Temperature tolerance||5 to 35 °C|
|Optimum temperature||18 to 30 °C|
|Carbonate hardness||0 to 12 °dKH|
|pH value||5 to 8|
|Carbon dioxide (CO2)||0 to 40 mg/l|
|Nitrate (NO3-)||10 to 50 mg/l|
|Phosphate (PO43-)||0.1 to 3 mg/l|
|Potassium (K+)||5 to 30 mg/l|
|Iron (Fe)||0.01 to 0.5 mg/l|
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