Eev. W. A. Leighton on the Oenus Ramalina. 125 



h. Spores curved. 

 24. B. reticulata (Noehd.). • 25. R. hogotensis^ Nyl. 

 26. R. chilensisy Bert, 



3. Stirps R. fraxinece. Tliallus compressed, more or less 



longitudinally striato-nervose or subcostato-unequal. 

 «. Cortical layer filameutose. 

 t Medulla K yellow, tlien red. 



27. R. suhpoUinana, Nyl. 28. R. denticulata (Eschw.) 

 and its var. canalicular is ^ Nyl. 



tt Medulla K-. 

 29. R. complanata (Sw.) ; ^R. Inji^odectodes ^ Nyl. 30. R, 

 peruviana^ Acli. 31. R. canalicidata^ I'^jl- ; ^R- l^~ 

 nearis (Sw.). 32. R. alludens^ Nyl. 33. R. calicaris 

 (Hffm.) and its vars. siibamj^liata, Nyl., and sidrfasti- 

 giataj Nyl.; *i?. ^oes^ert, Hochst. ^4:. R.farinaceaijj.)) 

 *R. protensa, Nyl. ; *i?. subconiplanata, Nyl. 35. R. 

 fraxinea (L.) and its vars. lylatyna, Nyl., and calicari- 

 formis^ Nyl.; *i?. fastigiata (Pers.) ; *R. conjirmata^ 

 Nyl. ; *R. suhcalicaris, Nyl. 36. R, sidtfraxinea^ Nyl., 

 and its var. suhcanaliculata^ Nyl. ; ^R. polycarj)a^ 

 Mnt.MS.; ^R.Menziesii^^uck.'^ *i?. interj)onens,ls^y\.', 

 *R. leiodea, Nyl. 37. R. cumanensis, F6e. 38. R. bis- 

 tortttj Nyl. 39. R. sorediantlia^ Nyl. 40. R. yemenensis 

 (Ach.) ; *i?. ovalis^ Tayl. & Hook. 41. R. lanceolata^ 

 Nyl. 42. R. sulcatula, Nyl. 43. R. sepiacea (Pers.). 



44. R. polymorpha^ Ach., and its var. capitata^ Ach. 



45. R. pollinariaj Ach. 



b. Thallus generally transversely or subreticulately unequal. 

 Cortical layer amorphous or nearly so. 



t Medulla K yellow, then ferruginous red. 



46. R. vulcania (Mnt). 



tt Medulla K-. 



47. R. Bourgceana, Mnt. 48. R. evernioideSj Nyl. 49. R. 

 maciformisj Delile. 50. R. crispafida, Despr. 51. R. 

 Wehhii, Mnt. 



4. Stirps R. scopulorum. Thallus firm, solidly corticate, 



subtereti-compressed, unequal on the surface ; external 

 portion of the cortex amorphous, internal portion fila- 

 mentose. 



t Medulla K yellow, then ferruginous red. 



52. R. scojiulorum (Dicks.) and its vars. incrassata, Nyl., 

 and nematodes, Nyl. ; *i?. decipiens, Mnt. ; */^. siih- 

 wehhiana^ Nyl. 



