Usnea

[ʌsniә]

解释:

(noun.) widely distributed lichens usually having a greyish or yellow pendulous freely branched thallus.

整理:劳埃德--From WordNet

解释:

(n.) A genus of lichens, most of the species of which have long, gray, pendulous, and finely branched fronds. Usnea barbata is the common bearded lichen which grows on branches of trees in northern forests.

布雷特整理