( 1-23 



to A'egetate, oi* at least to find a home. In the south of England, and 

 on the shores of France and Spahi, its place is sup])lied by the following- 

 species, and farther south by others, which, though 'closely allied, are 

 abundantly distinct. 



EXPLANATION OF PLATE CX. 



Fig. 1. — Ptilota plumosa, natural size. 

 2. — An involucre. 

 ;>. — Favellfe from same. 

 4. — Portion of lacinia with tetraspores. 

 5. — A tetraspore from same. All magnified. 



