374 R. HEBER HoweE, JR.: NOMENCLATURE OF GENUS USNEA 
Usnea florida (L.) Web. 
Cont. phase: Lichen hirtus L. 
Usnea florida Michx. 
Usnea plicata (L.) Web. = Usnea ceratina Ach. 
plicata var. barbata (L.) R. H. Howe = Usnea dasypoga 
(Ach.) Nyl. 
articulata (L.) Hoffm. 
Author’s 1910 paper, based on Dr. Wainio: 
Usnea florida (L.) Web. 
Syn. Lichen hirtus L. 
plicata (L.) Web. = Usnea ceratina Ach. 
barbata (L.) Web. or U. plicata var. barbata (L.) R. H. 
Howe = Usnea dasypoga (Ach.) Nyl. 
articulata (L.) Hoffm. 
Dr. Zahlbruckner; Engler & Prantl, Nat. Pflanzenfam.: 
Usnea florida (L.) Hoffm. 
ceratina Ach. 
dasypoga (Ach.) Nyl. 
dasypoga var. plicata (Hoffm.) Hue 
articulata (L.) Hoffm. 
The only correction made by me,* which has had general 
adoption, is the acceptance of Weber as the first author responsible 
for the combination Usnea florida as a binomial. 
During the year 1912, through the kindness of Dr. S. H. Vines 
and Dr. B. Daydon Jackson, I had the opportunity to study both 
the Dillenian and Linnean herbariums and also authentic Fries 
and Acharian material. I here present photographs of the types 
and trust that the problem may now be considered settled beyond 
all doubt. 
Series: Mesinae 
Chondroid axis one third the diameter of thalline filament. 
Usnea florida (L.) Web. I find two type specimens preserved 
in the Linnean herbarium in the apartments of the Linnean 5So- 
ciety, Burlington House, London. They are mounted on one sheet 
labeled Lichen floridus in Linné’s handwriting, with the Flora 
Suecica (1745) number 991 written below the specimens. These 
are typical (as long understood) and are well described in the 
original description. 
* Brought to my notice by Dr. J. H. Barnhart. 
