DESCRIPTION OF THE PLATES. 



xi 



4. Ditto, small pale variety, very sorediiferous, also from tlie 

 Cape de Verde Islands. 



5. Ditto, portion of a thalline filament magnified, showing 

 small, patellseform apothecia with a proper exciple, a; large, 

 irregular apothecia, without a proper exciple, b ; and soredia, c. 



6. Ditto, portion of a thalline filament magnified, showing 

 these forms of the apothecium sectioned. 



7. Ditto, section of one of the small apothecia more highly 

 magnified. 



8. Ditto, portion of a pale-warted, thalline filament of the 

 thickest " Lima Orchella-weed." 



9. Ditto, transverse section of ditto. 



10. Ditto, portion of a black- warted and geniculate thalline 

 filament of the thickest " Lima Orchella-weed." 



11. Ditto, spore. 



12. Ditto, spermatia of a variety. 



PLATE VI. 



1. Ramalina fraxinea, large variety. 



2. Ditto, section of mature and young apothecia, a; and of 

 thallus, showing spermogones, b. 



3. Ditto, section of a spermogone, showing sterigmata, sper- 

 matia, and network of filaments. 



4. Ditto, spores of specimens from various habitats, in dif- 

 ferent stages of development, a being mature, b old, and the re- 

 mainder young. 



