common hornwort; Ceratophyllum demersum
A submerged aquatic plant often used in aquariums and found in ponds and slow streams.
If you put hornwort in the aquarium, the water becomes clean.
Analipus japonicus; a brown alga
A species of brown alga found along Japanese coasts; less commonly encountered than the hornwort sense.
On this coast, a brown alga called matsumo can be collected.
Katakana spelling is common for this organism name; usually written in kana.
Hiragana spelling, also used.
Kanji spelling is rare; the word is usually written in kana.
The name literally means 'pine seaweed', from 松 (pine) and 藻 (seaweed/algae), referring to the plant's resemblance to pine needles.