LICHENS OF NOVA SCOTIA—MACKAY. 301 
2, R. pusilla, Poir. Not common on forest trees, Pictou. 
Gen. I].—CrETRARIA, Ach., Fr. 
3. C. ciliaris, Ach. Common on old bark, P. 
4. C. lacunosa, Ach. Frequent on old hemlock bark, North 
Dalhousie. Pictou. 
Var. Atlantica Tuck. Frequent on withered twigs of 
Conifer, Pictou. 
C. glauca Ach. Common on old fence logs, &¢., Pictou. 
C. juniperina, Ach. Rare. On twigs of some conifere, 
Gen, IT].—Everntia, Ach., Mann. 
7. £E. prunastri Ach. (2) Very rare. On dead wood, Pictou. 
Gen. [V.—UsnEA (Dill.) Ach. 
8. U. barbata, Fr. Very abundant. On coniferous trees, ete. 
var. florida, Fr. Common, Pictou. 
var. dasypoga, fr. Not uncommon, P. 
Gen. V.—ALEcToRIA, Ach., Nyl. 
9. <A. gubata, Fr. Common on dead dead wood, Pictou. 
var. chalyheiformis, Ach. On fence logs, Pictou, eom- 
mon on portions of the Magdalen Islands. 
FAM. 2—PARMELISI. 
GEN. VI.—THELOSCHISTES (Worm.) Tuck. 
10. TZ. parietinus (L., Duff.) Nyl. Very common. On north- 
ern exposure of neglected wooden buildings, on fences, trees, 
&¢e. Pictou. 
ot 
S 
GEN. VIJI.—PaArRMELIA, Ach., De Not. 
11. P. perforata Ach. On maple trees, Pictou. 
12. P. perlata, Ach, (?) On maple trees, North Dalhousie, 
Pictou. 
13. P. tiliacea, Ach. On trees, Pictou. 
14. P. Borrert, Ach. On spruce trees, Pictou and Truro. 
15. P. Saxatilis, Ach. Common on old fences, trees and 
rocks, Pictou. 
16. P. Physodes, Ach. Very common on trees, &¢., Pictou. 
17. P. caperata, Ach. On old bark, on trees, Pictou. 
18. P. conspersa, Ach, On granite boulders, N. W. Arm, 
Halifax and Pictou. 
