120 BIOLOGICAL SOCIETY OF WASHINGTON. 



Physcia aquila, Nyl. var. detonsa, Tuck, 

 pulverulenta, Nyl. 

 '• stellaris, L. 



" " var. aipolia, Nyl. 



" astroidea, Ach. 



" crispa, Nyl. 



" tribacia, Tuck. 



" caesia, Nyl. 



" obscura, Nyl. 



" " var. endochrysea, Nyl. 



" adglutinata, Nyl. 



Pyxine sorediata, Fr. 

 Fam. 3. PELTIGEREI. 



Sticta pulmonaria, Ach. 

 " amplissima, Mass. 

 " quercizans, Ach. 

 Nephroma lsevigatum, Ach. 



" Helveticum, Ach. 



Peltigera scutata, Leightf. 

 " aphthosa, Hoff. 



" polydactyla, Hoi). 



" rufescens, Hoff. 



" horizontalis, Hoff. 



" canina, Hoff. 



" " var. spongiosa, Tuck. 



" " " sorediata, Sch. 



" " " spuria, Ach. 



Fam. i. PANNAKIEI. 



Endocarpiscum Guepini, Nyl. 

 Physma luridum, Mont. 

 Pannaria lanuginosa, Koerb. 

 leucosticta, Tuck, 

 microphylla, Delis, 

 tryptophylla, Mass. 

 molybdaea, Tuck, 

 nigra, Nyl. 

 rubiginosa, Delis. 

 Fam. 5. COLLEMEI. 



Pyrenopsis Schaereri, Nyl. 



