Usnea mutabilis
| Usnea | |
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| Species: | U. mutabilis
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| Binomial name | |
| Usnea mutabilis | |
Usnea mutabilis is a grayish-yellowish pale green, unequally branching, shrubby (foliose) 3-7 cm long lichen commonly anchored on holdfasts on trees, mostly in eastern North America, sometimes in chaparral shurbs or pines in California.[1]: 212 It is darker green than other members of the Usnea genus.[1]: 212 The surface is covered with isolated, or clusters of, isidea.[1]: 212 It lacks apothecia.[1]: 212
The common name is bloody beard lichen.[1]: 212 The thick axis and medulla are dull red.[1]: 212