168 MIDDLESEX FLORA. 



PHYSCIA, (DC., Fr.) Th. Fr. 



P. speciosa, (Wuif., Ach.) Nyl. 



Watertown, Medford, Cambridge and Waltham (Tuckerman) , 

 P. hypoleuca, (Muhl.) Tuck. 



ISTatick. 

 P. comosa, (Eschw.) Nyl. 



Cambridge, very rare (Tuckerman). 

 P. aquila, (Ach.) Nyl., var. detonsa, Tuck. 



Natick. 

 P. pulverulenta, (Schreb.) Nyl. 



Cambridge, Waltham. 

 P. stellaris?, (L.) 



Natick, Sherborn. 

 P. stellaris, (L.), var. aipola, Nyl. 



Cambridge, Waltham. 

 P. tribacia, (Ach.) Tuck. 



Waltham, Sherborn. 

 P. hispida, (Schreb., Fr.) Tuck. 



Cambridge, Waltham. 

 P. Obscura, (Ehrh.) Nyl. 



Waltham, Sherborn, Natick. 

 P. setosa, (Ach.) Nyl. 



Natick. 



PYXINE, Fr., Tuck. 

 P. sorediata, Fr. 



Waltham. 



UMBILICARIA, Hoffm. 



U. Muhlenbergii, (Ach.) Tuck. 



Waltham (C. J. Sprague) ; Cambridge, Medford. 

 U. Dillenii, Tuck. 



Waltham. 

 U. pustulata, (L.) Hoffm., var. papulosa, Tuck. 



Waltham, Natick. 



STICTA, (Schreb.) Fr. 



S. amplissima, (Scop.) Mass. 



Waltham, Natick. 

 S. pulmonaria, (L.) Ach. 



Arlington, Waltham, Natick. 

 S. fuliginosa, (Dicks.) Ach. 



Waltham (Russell). 

 S. crocata, (L.) Ach. 



Waltham, Sherborn. 



