V 



XICnE:N"-I'LOKi OF IS^ORTHEEN' EUROPE. 409 



r 



landic, Faroese, and Norwegian collection is tlilrty-one, or about 

 12 '1 per cent. This arctic collection, wliile it contains only one 

 strictly arctic liclien {Bactylina arctica, Hook.), with a few alpine 

 or subalpine ones (such as Dufoitrea madreporiforrnis, Ach., Alec- 

 toria oclroleuca, Ehrh., Solorina erocea, L., and saccafa, L., I*la- 

 tysma nivah^ L., mid jumperinu7n, L., Parmelia stygia, Ach,, and 

 iunafa, L., Umhilicaria Jiyperhorea, Hffm., and Jiirstita^ Ach., Leca- 

 nora cMoro])lana, Whlnh., and fntstulosa, Dicks., and Lecidea al- 

 picola^ Sch.), contains also such common and almost ubiquitous 

 forms as Cladonia pyxidata^ L,, deformis, li.y yracilis, Hffm., ranyi- 

 ferinajTlffm., and bellidiflora, Ach., SplKsropTioron coralloides, Pers., 

 Alectoria juhata^ Ach., Farmelia saccatilis^ Ach,, and conspersa, 

 Ach., I^hyscia pulverulenta, Fr., and candelaria, Ach., Placodium 

 nurorum, Hffm., and eJeyans, DC, Lecanora sul/usca, Ach., and 

 ntellina^ Ach., Urceolaria scruposa, Ach., Lecidea geoyrapTiica^ Sch., 

 and lapicida, ~Fv. ' 



. Many of the lichens conta'ned in my list, which are, in Europe, 

 among the most characteristic alpine and northern forms, curiously 

 enough do not appear at all in lists of arctic lichens. For in- 

 stance, none of the following are to be found in the collections 

 either of Sir John Eichardson or Dr. Walker : 



1. Pyrenopsis hwmatopis, Smrf. 



2. JBceomyces placopJiyllus^ Ach. 



3. Sipliula ceratites, Fr, 



4. Parmelia arctica^ Th. Fr. 



5. P. centrifuya^ Ach. 



6. Uinhilicaria stipitata^ Nyl. 



7. U. atro-pruinosaj Sch. 



8. U, spodochroa, Hffm. 



9. U. fiocculosa, Hffm, 



10. Pannaria leucolepis, Whlnb. 



11. Placodium Iracteatmn, Hffm. 



12. Squamaria stroAninea^ Ach. 



13. Lecanora sinapisperma, DC. 



14. L. nimhosa^ Fr. 



15. X. pelohotrya, Smrf 



16. L. poUopTicea.Whhxh. 



17. i. arycpholis, Whlnb. 



18. L. atrO'Sulphurea,Wiilnh. 



r ^^ 



* - 19. L. epanora, Ach. 



20. L. nephdea^ Smrf. 



21. i. wo7yW/«tf, Whlnb. 



2 £ ^ 



