MIDDLESEX FLORA. 167 



Alectoria, (Aeh.) Nyl. 



A. jubata, (L.), var. chalybeiformis, Ach. 

 Natick. 



Theloschistes, Korm. 



T. chrysophthalmus, (L.), Norm. 



Waltham, Natick. 

 T. parietinus, (L) Norm. 



Cambridge, Waltham, Natick. 

 T. polycarpus, (Ehrli.) 



Waltham. 

 T. lychneus, (Nyl.) 



Cambridge, Natick. 

 T. concolor, (Dicks.) 



Natick, Sherborn. 



Paemelia, (Ach.) DeNot. 



P. perlata, (L.) Ach. 



Framingham and Chelmsford (Russell) : Waltham, Cambridge and 



Lexington. 

 P. perforata, (Jacq.) Ach. 



Waltham, Sherborn, Natick. 

 P. crinita, Ach. 



Cambridge, Waltham. 

 P. tiliacea, (Hoflfm.) Floerk. 



Waltham, Sherborn. 

 P. Borreri, Turn., var. rudecta, Tuck. 



Waltham, Sherborn. 

 P. saxatilis, (L.) Fr. 



Waltham, Sherborn, Natick. 

 P. saxatilis, (L.) Fr., var. sulcata, Nyl. 



Waltham. 

 P. physodes, (L.) Ach. 



Waltham, Sherborn. 

 P. colpodes, (Ach.) Nyl. 



Waltham. 

 P. olivacea, (L.) Ach. 



Waltham, Natick. 

 P. caperata, (L.) Ach. 



Waltham, Sherborn, Natick. 

 P. conspersa, (Ehrh.) Ach. 



Cambridge, Waltham, Natick. 

 P. ambigua, (WuK.) Ach., var. albescens. Wahl. 



Cambridge. 



