Thank you friends, for your kind words !
Annick, ziggy you were right!!! Mystery has been solved!
Quote:
Mermaid's umbrella algae maybe?
Acetabularia -- Britannica Online Encyclopedia
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Indeed, this is
Acetabularia! Hurrra and huzzza! I've heard about this algae, especially during cell biology courses! It's amazing! Made of single gigantic cells! I will "have" a closer look on it with my macro lenses
I've almost finished writing an article about some technicalities and HDR photography for aquaristic purposes!