R. H. Howe: LINNAEAN NOMENCLATURE OF Usnea 609 
We therefore have the Linnaean nomenclature of Usnea as 
follows: 
Genus: Usnea (Dill.) Adans. 
Type species (if we recognize such): UsNEa PLICATA (L.) Web. 
Species: USNEA PLICATA (L.) Web. 
USNEA BARBATA (L.) Web. or USNEA PLICATA BARBATA 
(L.) R. H. Howe, Jr. 
USNEA ARTICULATA (L.) Hoffm. 
UsNEA FLORIDA (L.) Web. 
Syn. Lichen hirtus L. 
THOREAU MUSEUM, 
Concorp, Mass. 
