14 On the lAchens near New-York. 



16. Parmelia. 

 ^ Frond with segments of equal thickness at the apex. 



1. placorodia. Id. p. 196. Trunks, stones, &c. Frond livid 



pale, underneath smooth and whitish, with black fibres. 



2. crinita. Id. p. 196. Ibid. Frond grayish green, bearing 



branching coralline papillae, underneath smooth, black, 

 margin ciliated. 



3. caperata. Id. p. 196. Ibid. Frond pale greenish yel- 



low, underneath black hispid. , 



4. Borreri. Id. p. 197. Bark and on mosses. Frond gray, 



with whitish soredia ; apothecia with a crenate, sub- 

 lobed margin. 



5. scortea. Id. p. 197. On trunks. Frond subcoriaceous, 



whitish gray, black dotted, sublucid. 



6. perlata. Id- p. 197. Ibid, and stones. Frond grayish 



green, villose underneath. 



7. perforata. Id. p. 198. Bark, and stones. Disk of the 



apothecia perforated. 



8. herbacea. Id. p. 198. Trunks, and on the earth. Frond 



smooth, coriaceous, suborbicular ; apothecia small, 

 central. Has been removed to Sticta by Acharius. 



9. tiliacea. Id. p. 199. Trunks. Frond grayish green, sub- 



pruinose, not dotted as in No. 5. 



10. olivacea. Id. p. 200. Trunks and rotten wood. Frond 



dark olive, shining. 



11. plumbea. Id. p. 202. Earth on mosses. Frond dark 



lead, and blackish when old. 



12. saxatilis. Id. p. 203. Rocks and trunks. Segments 



generally reticulately lacunose on the upper surface, 

 truncated at the apex. 



13. aleurites. Id. p. 208. Bark. Frond generally covered 



with granular dust, much laciniated at the margin ; 

 apothecia light, margin crenulated. 



14. centrifuga. Id. p. 209. Ibid. Frond greenish, divided 



through its whole surface into radiating segments. 



15. conspersa. Id. p. 209. Ibid. Frond greenish, dotted 



black. 



