LICHENS. 211 



ploring the highlands much more thoroughly than we 

 were able to do. The pitted species (S. scrobiculata, 

 Plate XIV., Jig. 24), is a very handsome lichen, of a dull 

 green externally, and ornamented by powdery warts con- 

 taining clusters of gonidia ; the under side is dark and 

 hairy, with deep pits honeycombing its surface. The 

 yellow Sticta (S. crocata) is a magnificent species, olive 

 and veined with yellow, and with lemon spots on its 

 under surface. It grows in Ireland, and is very rare. 

 The broad leaved Sticta is also an Irish species ; and, 

 like the yellow, is very scarce. The family contains 

 several other members, but the two first mentioned are 

 the only ones that grace our collection. 



