This box is a container for permanent use as storage or transporting contents.
"Piece of the frond of Fucus platycarpus furnished with receptacles." -Lindley, 1853
"Fucus platycarpus...Section of a conceptacle much magnified." -Lindley, 1853
"Fucus platycarpus...3. jointed branching hairs detached from the sides of the conceptacle and bearing…
"Fucus vesiculosus: showing the receptacles of the fructification a, a, at the ends of the branching…