R. H. Howe: MANUAL OF THE GENUS USNEA 15 
genus Uszea from North and Middle America, and is as complete 
as a thorough investigation of the literature can make it, though 
no doubt it has been impossible to trace all descriptions. The 
citations have all been verified, and checked twice. No attempt 
has been made to include all the various published combinations, 
which have varied from binomials even to quinquenomials 
(Schaerer). 
Usnea angulata Ach. Synop. Meth. Lich. 307. 1814: 
“ Americae Septentrionalis.’’ 
Lichen barbatus L. Sp. Pl. 1155. 1753: “ Europae & Amer- 
icae septentrionalis.”’ 
Usnea californica Herre, Proc. Wash. Acad. Sci. 7: 345. 
1906: ‘Alpine Creek Cafion, San Mateo County, California” 
= U. plicata (L.) Web. 
U. cavernosa Tuck. in Agassiz & Cabot, Lake Superior 171. 
1850: ‘* Lacus Superioris.” 
U. trichodea var. ciliata, Mill.-Arg. Flora 60: 77. 1877: 
“‘ Dallas, Texas,” 
U. cornuta Flot. Linnaea 17: 16. 1843: ‘In montibus 
simensibus”” (Abyssinia) ; reported from British America by 
Stirton. 
U. articulata var. dimorpha Mill.-Arg. Flora '74: 372. 1891: 
“¢ Cuba.” 
U. endochrysea Stirt. Scot. Nat.6: 107. 1881: ‘‘ Alabama”’ 
= U. florida (L.) Web. 
U. filaris Ach. Synop. Meth. Lich. 307. 1814: ‘“ America.” 
U. filipendula Stirt. Scot. Nat. 6: 104. 1881: “ America 
bor.” ; = U. plicata barbata (L.) R. H. Howe. 
U. florida var. intermedia Michx. F1. Bor.-Am. 2: 332. 1803: 
‘“* Carolina.” 
U. jamaicensis Ach. Lich. Univ. 619. 1810: “ Jamaicae.” 
U. lacunosa (Willd. ex Delise MS.) Nyl. Synop. Lich. 271. 
1858-60: ‘“‘ America boreali, Michigan” ; = U. cavernosa Tuck. 
U. linearis A. Schneider, Guide Study Lich. 167. 1898 ; (?) 
= U. plicata (L.) Web. 
U. florida var. major Michx. FI. Bor.-Am. 2: 332. 1803: 
“ Carolina.” 
U. mutabilis Stirt. Scot. Nat. 6: 107. 1881: “ Alabama” 
= U. florida (L.) Web. 
