CATALOGUE OF PLANTS. 251 



* R. pollinaria, Ach. 



Small and imperfect specimen, but distinct (Eckfeldt). 



* R. polymorpha, Ach. 



On rocks in small patches (Eckfeldt). 



CETRARIA, Ach. 



C. aculeata (Schreb.), Fries. 



Green Mt. (Wilson, T. G. White) ;— Browns Mt. (Rand). 



* C. Islandica (L.), Ach. 



On the ground. (Eckfeldt.) 

 *Var. DelissBi (Bor.), Nyl. 



(Eckfeldt.) 

 C. cucuUata (Bell), Ach. 



On the ground. (Eckfeldt.) 

 C. nivalis (L.), Ach. 



On the ground. (Eckfeldt.) 

 C. aleurites (Ach.), Th. Fries. 



Generally sterile. On trees and dead wood (Eckfeldt); — on 

 fence rails, Seal Harbor (Wilson). 



C. Fahlunensis (L.), Schaer. 



On rocks. (Eckfeldt) ; — Seal Harbor (Wilson). 



C. ciliaris, Ach. 



On trees and fence rails. (Eckfeldt); — Seal Harbor (Wil- 

 son); — Somesville (E. Faxon). 



C. lacunosa, Ach. 



On trees. (Eckfeldt) ; — Seal Harbor (Wilson). 



* Var. stenophylla, Tuck. 



(Eckfeldt.) 

 C. glauca (L.), Ach. 



On trees and rocks. (Eckfeldt); — Seal Harbor (Wilson, 

 Redfield). 



