16 R. H. Howe: MANUAL OF THE GENUS USNEA 
Lichen plicatus L. Sp. Pl. 1154. 1753: ‘“ Europae & Americae 
borealis.” 
Usnea florida var. rubiginea Michx. Fl. Bor.-Am. 2: 332. 
1803: ‘* Canada.” 
U. scoparia Fée, Dict. Class. d’Hist. Nat. 16: 482. 1830: 
“? Amérique du Nord.” 
U. sphacelata R. Brown, Parry’s Ist Voy. app. 307. 1824: 
“Melville Island”; = Lichen sulphureus Zoega, in Olafsen & 
Povelsen, Rejse ig. Island, Tilhang 16. 1772. 
' U. florida, + strigosa Ach. Meth. Lich. 2: 310. 1803: 
“ America septentrionali.”’ 
U. subfusca Stirt. Scot. Nat.6: 108. 1881: ‘Owen Sound,” 
Ontario; = U. florida (L.) Web. 
U. trichodea Ach. Meth. Lich. 2: 312. 1803: ‘‘ Nova Scotia.” 
U. variegata Stirt. Scot. Nat. 6: 105. 1881: ‘Niagara 
Falls” = U. florida (L.) Web. 
To all those persons enumerated in my former paper, to 
Messrs. A. C. Herre of California, F. G. Blake of Brookline, 
Mass., Drs. H. E. Hasse of Sawtelle, Cal., Fred. Elfring of Hel- 
singfors, A. Schneider of California, Prof. John Macoun of Ottawa, 
and to many others I owe much gratitude, as well as to Dr. C. 
Hart Merriam, Chief of the Biological Survey, Washington, D. C., 
for his kind permission to reproduce the map of faunal areas, 
published in Bulletin 10 of the Survey. 
THOREAU MUSEUM, 
CONCORD, MASSACHUSETTS 
Explanation of plates 1-7 
PLATE I 
Life zones of the United States, by C. Hart Merriam. Orthochromatic reproduc- 
tion of colored plate (U. S. Dep. Agric., Div. Biol. Survey, Bull. No. 10). All 
northern Canada, not shown on this map, is in the Boreal zone. 
PLATE 2 
1. Usnea florida (L.) Web. = [Usnea vulgatissima]. Dillenius’ figure, Hist. 
Muse. p/. 17. f. 12, 137. I74l. 
2. Specimen representing phase (/) from Herbarium Sullivant Moss Chapter. 
3. Specimen representing highest type of development (slightly reduced) from 
herbarium of Dr. L. W. Riddle, Wellesley, Mass. ( Pringle, no. 10755), collected in 
Cuyamaloza, State of Hidalgo, Mexico. 
