580 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



This is a striking and distinct species, belonging to the section 

 Eiiarthonia, and marked by the comparatively thick, rimulose, 

 very white thallus, in which are immersed the dark, difform 

 apothecia, with the disk slightly sunken below the surface of the 

 thallus. 



Type: on bark of Pisonia suhcordata, Anegada Island, West 

 Indies; coll. N. L. Britton and W. C. Fisklock, Feb. 19-20, 1913; 

 no. 987; in herb. L. W. Riddle. Duplicate in herb. New York 

 Botanical Garden. 

 Ramalina denticulata (Eschw.) Nyl. 



On a twig. 

 Buellia parasema var. aeruginascens (Nyl.) Muell. Arg. 



On a twig. 

 Anthracothecium libricolum (Fee) Muell. Arg. 



On Acacia anegadensis. 

 Arthopyrenia fallax (Nyl.) Arnold. 



On Pisonia suhcordata. 

 Pyxine Meissneri Tuck. 



On a twig. 

 Glyphis cicatricosa Ach. 



On a twig. 



