MIDDLESEX FLORA. 167 



Alectokia, (Ach.) JSTyl. 



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

 Natick. 



Theloschistes, Norm, 



T. chrysophthalmus, (L.), Norm. 



Waltham, Natick. 

 T. parietinus, (L) Norm. 



Cambridge, Waltham, Natick. 

 T. polycarpus, (Ehrh.) 



Waltliam. 

 T. lychneus, (Nyl.) 



Cambridge, Natick. 

 T. concolor, (Dicks.) 



Natick, Sherborn. 



Parmelia, (Ach.) DeNot. 



P. perlata, (L.) Ach. 



Framingham and Chelmsford (Russell) : Waltham, Cambridge and 



Lexington. 

 P. perforata, (Jaeq.) Ach. 



Waltliam, Sherboru, Natick. 

 P. crinlta, Ach. 



Cambridge, Waltham. 

 P. tiliacea, (Hoftm.) 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, Waltliam, Natick. 

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



Cambridge. 



