Filamentous Algae from an artificial pond

I recently was exploring a Herbal Garden maintained by the municipal corporation near my home. It has a small lotus pond, which blooms for some part of the year. I found filamentous layers of certain algae near the surface and I picked a small sample from them.

the artificial pond that is source of the sample

I made a slide out of it, and saw amazing details under the foldscope.

The sample that I used.
The slide itself, where i used a single filament of the algae.
Magnified using the phone option. I wonder what is that protruding on the sides.

I would love to have some feedback, and learning a little about the structures I’ve observed.

Manan

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