378 DR. LAUDER LINDSAY ON THE 



Yar. ompJialodes^ Acli. Saxicolous ; sometimes with a peculiar 

 "bluii<li bloom on the blackish- brown glistening thallus. 



Yrt. pannifonniSj Ach. Saxicolous. AVith the former variety, 

 moutane or alpine. 



38. P. conspersa, Ach. Saxicolous and corticolous ; very common ; 



very variable, especially as to the colour and size of the 

 thalline laciniaej frcq^uently in fruit and spermogoniferous. 

 On walls, Eomsdal ; on boulders about Christiania ; on 

 junipers, Dovrefjeld. Passes apparently into the following. 



39. P. centrifuga, Ach. Saxicolous and corticolous (Fogstuen) ; 



terricolous (Sneehatten) ; frequently in fruit, and spermo- 

 goniferous. Perhaps even more abundant tlmn the pre- 

 ceding, to which it appears to me to be really referable. 

 Its apothecia and spores are essentially the same as those 

 of P. conspersa ; w^hile the only difference is in the size ana 

 division of the thalline lacinire. P. centrifuga, however, 

 seems a more alpine and northern form than P. conspersa. 



40. P. oJivacea, Ach. Corticolous and saxicolous, common. On 



old cracked bark of birch, and on fir branches, in the forests 

 of Guldbrandsdal ; on ash, and also on boulders, about 

 Christiania. 



41. P. exasperata, Ach. Occurs in the same localities and habitats 



as the preceding, of which I consider it a variety. Both 



are frequent in fruit. 



42. P. 5ifyy/a, Ach. Saxicolous, common on theDovrefjeld: in fruit. 



43. P. lanata, L. Saxicolous, common on the Dovre- and Haa- 



langen-iQelds : both sterile and in fruit. Some forms are 

 extremely like certain saxicolous states of Alectoriajulata 



in herbaria. 



ifc 



44. P. phgsodes, Ach. Corticolous and saxicolous : frequently 



spermogoniferous, rarely bearing apothecia. Common on 

 fir branches in the forests of Guldbrandsdal. 

 Var. oiscwra^fif, Ach. (Hepp, Exs. 585), Haalangenfjeld. In the 

 Herbarium Kew, there is a Norwegian specimen from 

 Sommerfelt, Un. It. 1828, as deeply bronzed as P. oUvacea, 



which it much resembles. 

 Var. vittata, Ach. 



Var. labrosa, Ach. 



Are more or less plentiful in the mountain-valleys. 

 45. p. encausta, Sm. Saxicolous, common on the Haalangenfjeld; 



frequently in fruit and spernjogoniferous ; varies much as 

 to the colour and size of the thalline lacinise. 



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