bladder wrack

bladder-wrack的词性：
n.（名词）

1. Any of certain rockweeds, especially the widely distributed Fucus vesiculosus, having forked, brownish-green branches with gas-filled bladders.
黑角藻：一种岩草，尤指广阔分布的多小囊体的墨角藻属 ，有叉状的，棕绿色充满气泡的枝条