rockweed

[ rok-weed ]

/ ˈrɒkˌwid /

a fucoid seaweed growing on rocks exposed at low tide.

Origin of rockweed

First recorded in 1620–30; rock¹ + weed¹

That means that you are crushing the little bladder-like swellings strung like big beads on the stems of the rockweed.

The Animal World, A Book of Natural History |Theodore Wood
"I've made their dory fast in a little gulch among the rockweed," said he.

Jim Spurling, Fisherman |Albert Walter Tolman
The right amount of heat has been obtained, a barrow load of rockweed is brought—rockweed, not seaweed.

Suppers |Paul Pierce
Magnified section through a fertile conceptacle of Rockweed, showing the large spores in the midst of threads of cells.

The Elements of Botany |Asa Gray

The violent throbbings of her heart could be seen undulating the long hair as the moaning sea tosses the rockweed.

The Minister's Wooing |Harriet Beecher Stowe

rockweed

/ (ˈrɒkˌwiːd) /

any of various seaweeds that grow on rocks exposed at low tide