1G4 



III. 



49. Lecanactis, . . . . 



50. Platygraplia, . . 



51. Melaspilea, . . . . 



52. Opegrapha, . . . 



53. Xylographa, . . 



54. Grapliis, 



55. Cbiodecton 



56. Glyphis, 



57. Arthonia, 



58. Mycoporum, . . 



59. Agyrium, 



IV. 



60. Siphula, 



61. Sphaeroplioruig, 

 63. Acroscyplius, . . 



63. Acolium 



64. Calicium, 



65. Coniocybe, 



V. 



66. Endocarpon, . . 



67. Normandina, . . 



68. Segestria, 



69. Staurotliele, . . . 



70. Trypethelium, 



71. Sagedia, 



72. Verrucaria, . . . . 



73. Pyrenula, 



74. Pyrenastrum,. 



75. Strigula, 



N.E. 



1 

 1 

 1 

 7 

 3 

 3 



17 

 1 

 1 



2 



19 



3 



4 



2 

 1 

 2 

 1 

 4 

 10 

 8 



399 



An interesting feature of onr Lichen Flora, is tlie fact tliat a num- 

 ber of species whicli occur in Europe, have as yet been found only 

 in the western portion of North America, from Nebraska to the 

 Pacific, only a few of which are connected with Europe through 

 the intervening Arctic region, which are indicated in the following 

 list: 



