124 Rev. W. A. Leighton on the Genus Ramalina. 



subsimple or pauciarticulate, and are accompanied by elon- 



fated and anastomosing filaments, as represented in Tulasne's 

 [dm. Lich. t. 2. f. 13-15. The form of the spermatia is pe- 

 culiar, being straight cylindrical or oblongo-cylindrical, ap- 

 parently more solid at the obtvise apices than in the middle. 



The species are thus arranged : — 



A. Spermogonia in conceptacles entirely black. 



a. Cortical layer very thin, fragile, here and there cribrose; 



thallus cylindrical, soft, internally empty. 



1. R. tiumi's, Mont. (Medulla K — .) 



b. Thallus rigescent, internally filled with a woolly me- 



dulla ; cortical layer without longitudinal filaments. 



2. B. cerucMs (Ach.). 3. R. comheoides, Nyl. 4. R. ho- 

 malea, Ach. 5. R. testudinaria^ Nyl. 6. R. Jlacces- 

 cens, Nyl. (Medulla in all K - .) 



c. Thallus rigescent, fruticulose ; cortical layer formed of 



longitudinal filaments. 



7. R. melanothrix, Laur. (Medulla K — .) 



B. Spermogonia half-black. 



8. R. carjpathicaj Krbr. (Medulla K — .) 



C. Spermogonia in pale or colourless conceptacles. 



1. Stirps R. gracilis. Thallus attenuate, fruticulose, sub- 



terete or subanguloso-terete, or attenuato-compressed ; 

 cortical layer filamentose. 



t Medulla K yellow, then red. 



9. R. rigida(PeYS.). 10. R. awcejos, Nyl. 11. R. ara- 

 bum (Ach.). 12. R. dasypoga^ Tuck. 



ttMedullaK-. 



a. Spores straight, or nearly so. 



13. R. gracilis (Pers.). 14. R. angulosa, Laur. 15. R. 

 imfplectens^ Nyl. 16. R. thrausta (Ach.). 17. R. 

 gracilentaj Ach. 18. R. Montagnei, D. N. 19. R. 

 taitensis, Nyl. 



b. Spores curved. 



20. R. camj)tospot'a, Nyl. 



2. Stirps R. usneoidis. Thallus lineari-attenuate, elongate, 



compressed, generally pendulous, striate or substriatu- 

 late. Medulla K - . 

 a. Spores straight. 



21. R. australiensisy Nyl. 22. R. rectangular is ^ Nyl. 

 23. R. usneoides (Ach.) and its vars. usneoidella^ Njl-) 

 and cajyensisj Nyl. 



