In August the bloom of Azolla has started to increase. I added Azolla to the pond several years ago and have in the past had to skim it off as it covers the complete surface in late summer. It does provide good compost material with high Carbon and Nitrogen content. It normally cannot live in Northern climates but somehow has survived well here in the pond.
A good reference can be found at the Azolla Foundation
The Azolla Foundation was set up by Azolla Biosystems Ltd founders Alexandra and Jonathan Bujak to provide a platform for sharing information about Azolla and its contribution to new technologies such as space exploration and planetary colonization.”
Also, the Nitrogen Fixation is the result of a sysmbiotic relationship between azolla and a cyanobacteria. This reference shows the formula for the process: