15. Usnea lacunosa Willd. 
““ America boreali, Michigan.’’ (Willd. ex Del. mser.) 
Nyl. (Syn. Lich. 271. 1858-60.) 
““Thallus albo-flavescens vel pallescens pendulus foveo- 
lato-scrobiculatus angulosus (subtriqueter) ramosissimus, 
ramis teretibus attenuatis intricato-implexis sparse fibrillosis; 
apothecia sat parva albida vel albido-glaucescentia, margine 
receptaculari fibrilloso-ciliato; sporae parvae longit. 0,007 —8 
millim., crassit. 0,005 millim.’’ 1. ¢. 
16. Usnea linearis Schneider =? Ramalina linearis. 
North America. (Guide Study Lich. 167. 1898.) 
““Thallus medium, of several main branches, bearing 
numerous long, slender, cylindrical branches; greenish-gray.’’ 
Lae: 
17. Usnea lorea Fries. 
‘‘ America meridionalis.’’ (Syst. Orb. Veg. 282. 1825.) 
‘elongata, pendula, laevigata, glabra, subsimplex, fus- 
cescens, fibrillis lateralibus nullis, apotheciis pallidis subinte- 
gris appendiculatis.’’ 1. ¢. 
18. Usnea florida var. major Michx. 
- Carolina.” ~ (FI, Bor.-Am. 2: 382. 1803:) 
““seutellis luteolo-pallidis.’’ 1. ¢. 
19. Usnea mutabilis Strt. 
““Alabama.’’ (Scot. Nat. 6: 107. 1881.) 
“Similis U. cornutae sed fibrillis medullaribus exacte ut 
in Usnea endochrysea.’’ 1. ¢. 
20. Lnchen plicatus Linn. 
“‘ Americae borealis.’”’ (Spec. Pl. 2: 1154. 1753.) 
*‘filamentosus pendulus, ramis implexis, scutellis radia- 
1c; 
No type specimen exists in the Linnean Herbarium, Lon- 
don. 
21. Usnea florida var. rubiginea Michx. 
' Canada.” (Fl. Bor-Am: 2: 382. 1803.) 
““minus hirta, rubigineo-rubens; scutellis concoloribus.”’ 
le: 
9? 
tis. 
20 
