Usnea florida


Usnea florida

(L.) F.H. Wigg. (1780)
Conservation Status
NT ? P Eng Sc Wa (Key)
BLS Number
Taxon Photo
General Description

Thallus yellow-green to grey- green, bushy, up to 5 cm tall. Base persistent and generally cracked and blackened. Medulla thin with a stout central core. Main and secondary branches have many pointed branchlets but have no isidia or soralia. Fawn apothecia (up to 1 cm) are frequent at the end of branches. They are surrounded by ray-like spinulose branchlets.


Chemistry: Medulla K+ yellow, P+ orange-red.

Similar species: Usnea subfloridana and U. wasmuthii are similar when fertile but with fewer apothecia and with both isidia and soralia.

See also Fungi of Great Britain and Ireland


Mainly on twigs and branches in the canopy of broad-leaved trees but occasionally on other exposed, well-lit surfaces. In sheltered and humid locations.

Distribution Map
Key to map date classes

South and West of Britain and Ireland, but rare in Southern Scotland.

Threats & Status

Very sensitive to ammonia pollution and declining due to agricultural intensification

Britain: Near Threatened 

England: Section 41 species

Wales: Section 7 species

Scotland: Priority Taxon for Biodiversity in Scotland 


Species Description PDF

Lichens of Wales

Text by David Brabban & Neil A Sanderson