Nori is a Japanese edible seaweed. The main ingredient is a dried red algae. It is used to wrap rolles of sushi or onigiri. Also nori is made in the form of sheets.
Nori Media
Nori sheet under a microscope, magnification 200×
Cakes and Food Made of Seaweed by Kubo Shunman, nineteenth century
Toasting a sheet of nori, an 1864 print by 江戸自慢三十六興
Monument to Dr. Drew-Baker, Kumamoto Prefecture Uto City