noun
oyster thief; pocket thief; brown algae (Colpomenia sinuosa)
A species of brown algae that forms hollow, bladder-like sacs. The English common names 'oyster thief' and 'pocket thief' refer to its tendency to envelop small objects. Used in biological and culinary contexts.
フクロノリは潮間帯の岩に付着して育つ褐藻です。
Oyster thief is a brown algae that grows attached to rocks in the intertidal zone.
この辺りではフクロノリを味噌汁の具にすることもある。
Around here, they sometimes put oyster thief in miso soup.
From 袋 (fukuro, 'bag') + 海苔 (nori, 'seaweed'), referring to its hollow, sac-like shape. The exact historical derivation is uncertain.