LICHEN^-FLOKA OF NOKinERX EUROPE. 377 



24. P. juniper inum^ L, Corticolous and saxicolous (on twigs of 



shrubs and on boulders), DovreQeld and Guldbrandsdal. 

 Frequently in fruit, and spermogoniferous. 



25. P, pinastri^ Scop. Equally abundant in the same localities 



and habitats as the preceding, to which it is allied, if it is 

 not a mere form thereof. Occurs also on weathered timber. 



26. P. glaucumy L. Corticolous, saxicolous, and terricolous, com- 



mon. In the fir-woods of Guldbrandsdal ; on trunks of 

 pines about Christiania, Smrf. U. I. 1828, in Herbarium 



ground 



mosses, &c, 

 Vovm faUax, Ach. On ash about Christiania. 

 . JVephro7nium iomeniosum, HfFm. Jerkin, 



28. If, Icjevigatumy Ach., various forms. Corticolous, in the fir- 



woods of Guldbrandsdal. Saxicolous, Haalangenfjeld, 

 Eomsdal, and Vaage Vand. 



29. Peltigera aphthosa, Hffm. Terricolous and muscicolous, com- 



mon on the Dovrefjeld, 



30. J*, malacea^ Fr. Apt to be confounded with P. horizontalis, 



31. P, canina^ Hffm., in various forms ; common. Eomsdal ; 



Christiansand. 



32. P. Jiorizontalis^ Hffm. Eomsdal; Jerkin. Common. 



33. Solorina crocea^ L. Terricolous, HaalangenQeld ; abundant 



and in fruit about the glacier at Fogstuen. 



34. Stictina scrobiculata, Scop. Corticolous, Eomsdab 



35. Sticta 2^ulmonacea, Ach. Corticolous, Yaage Vand. 



36. Pannelia tiliacea^ Ach., form Iceugata, Ach. Corticolous (on 



ash), about Christiania : closely resembling form leucochroa^ 

 Wallr., of Parmelia saxatilis. 

 Form scortea, Ach. Saxicolous (on boulders), about Christiania. 



37. P. saxatilis^ Ach., ^\dth its forms leucocTiroa^ ^Vallr., and/wr- 



fnracea, Schser., and its ochraceous and whitish conditions 

 with all their transition states. Corticolous forms are 

 generally, as with us, light-coloured, large-lobed, and 

 smoothish : common on birch bark, especially where it is 

 old and cracked, as well as on various firs or pines in the 

 forests of Guldbrandsdal and Eomsdal. Saxicolous forms 



T 



arc, on the other hand, more generally dark-coloured or 

 ochraceous, small-lobed, and furfuraceous : on boulders 

 about Christiania, and on all the mountain- ranges. Seldom 

 fertile, especially the corticolous forms ; frequently, how- 



thallus 



2c2 



