Order: Lecanorales Family: Parmeliaceae
Species: Usnea wasmuthii
Photos: On fallen oak branch. Milmorane, Co. Cork, SW Ireland.
Specimen identified by John Douglass
Very similar to Usnea subfloridana and has been regarded as a chemotype. Soralia are more oval and isidiomorphs +/- restricted to main branches. Base blackened but with a different cracking-pattern. Apothecia absent.
Very local distribution on deciduous trees, most Irish records are from the NW. Often found with U. subfloridana.
Chemical reactions are variable, either soralia and medulla K-, P-
or soralia K+ yellow-orange to red, P+ yellow after 1 minute.
(U. subfloridana is P+ yellow-orange instantly)
Usnea wasmuthii. October 2009