(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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). usnea. Retrieved September 29, 2026, from http://smartdefine.org/usnea/definitions/2078377 |
| Chicago | Webster's. 2011. "usnea" http://smartdefine.org/usnea/definitions/2078377 (accessed September 29, 2026). |
| Harvard | Webster's 2011, usnea, Smart Define, viewed 29 September, 2026, <http://smartdefine.org/usnea/definitions/2078377>. |
| MLA | Webster's. "usnea" 28 May 2011. Web. 29 September 2026. <http://smartdefine.org/usnea/definitions/2078377> |