oedogonium (genus of filamentous green algae)
Scientific term for a genus of freshwater green algae with distinctive reproductive structures. Typically written in katakana.
When we looked at the pond water under a microscope, we could observe filamentous colonies of oedogonium.
Katakana spelling is common for this biological term; the kanji form 鞘味泥 is rare and mainly of academic interest.
Ateji kanji form; rarely encountered outside specialized contexts.
The Japanese name サヤミドロ is likely derived from 鞘 (さや, 'sheath') and みどろ (a term for filamentous algae), referring to the sheath-like structures in its reproductive cycle. The exact derivation is uncertain.