206 



in Norway — for which, however, he had not the necessary authori- 

 ties. Excluding the Leprarire, Spilomata, and Variolarise, and re- 

 ducing, according to the Friesian method, a large number of spe- 

 cies to varieties, he had been able to determine about 165 species ; 

 which, probably, includes the largest part of the Lichenes of this 

 small district. The following table shows the comparative condi- 

 tion of the species of each genus in the two districts above named, 

 so far as known : 



Tribes. 



Genera. 



No. of species No. of species 

 in the Euro- in N. Eng- 

 peanDist's. land. 



Of which pe- 

 culiar to 

 N. Engl'd 



Parmeliaceae, . 



Lecidinese, . . 



Graphidiese, 



Caliciece, . . 

 Sphaerophorese, 



Endccarpese, . 



Verrucarieee, . 



1 Usnea, . 



2 Evernia, . 



3 Ramalina ; 



4 Cetraria, 



5 Nephroma, 



6 Peltigera, 



7 Solorina, 



8 Sticta, . 



9 Parmelia, 



10 Gyalecta, 



11 Stereocaulon, 



12 Cladonia, . 



13 Beeomyces, . 



14 Biatora, . . 



15 Lecidea,-. . 



16 Umbilicaria, 



17 Opegrapha, . 



18 Leeanaetis, . 



19 Coniocybe, . 



20 Calicium, . 



21 Sphserophoron 



22 Siphula, . . 



23 Endoearpon, 

 [24 Pertusaria, . 

 .25 Thelotrema, 



2G Segestria, . 

 27 Verrucaria, . 



07 



290 



163 



The species noticed in the paper are, Usnea longissima. Ever- 

 nia ochroleuca. Cetraria nivalis. Pelligera malacea. Sticta glo- 

 merulifera. Parmelia incurva, amkigua, aleurites, detonsa, hy- 

 poleuca, rubiginosa, lanuginosa, straminea, murorum, oculata, ver- 

 rucosa,, Stereocaulon corallinum, paschale, denudatum, condensation. 



