1 92 1. No. 7. STUDIES OX THE LICHEN FLORA OF NORWAY. 209 



<B. L.». Opl. Ringebu: \'aala (B. L.l, Fokstuen (Zett.), Vaage: Lalm (B. L.I, 

 Brurvik (B. L.), and Kleivsæter (B. L.), Lorn ISomrft.): Roisheim (B. L.l, 

 Toten: Mustad I Kiær I, Lunner: Sylvtjernhogdene (Lid I, Brandbu IB. L.l, 

 A'albykampen (B. L.l, Fluberg: Lia (B. L.l, X'alders: Bitihorn (MoeI. 



Sorfr. Trondhjem (KindtJ, Dovre (M. N. Bl.I: Kongsvoll (Zett.I, Fæ- 

 munden: Sorken (B. L.l. Nordtr. Stjørdalen (Somrft.). 



Nordl. Torghatten (Lid), Rede (Norm.), Saltdalen (Somrft.), Serfolla: 

 Xævigaard (Norm.), Steigen: Loveen (Norm. I. Tronis. Gibostad (Norm.1, 

 Maalselven: Moen (B. L.), Dividalen (Norm.), Rognmo (B. L.l, Elvevoll (B.L.I, 

 and Likka\arre (B. L.l, Bardo: Saarivuobme (B. L.l; Ramtjorden (B. L.), 

 Tromsø (Norm. I; Lyngen: Lyngseidet (B.L.I, and Skibotn (B.L.I; Karlso 

 (Malmgr.I, Nordreisa (Norm. I, Sappen (B. L.l. Fiinii. Alten: Rautasvarre 

 (B.L.I, Kvaloen (Wbg.I, Havosund (Norm. I; Karasjok (Norm. I, Anarjok 

 (Norm. I; Laksetjord: Nordkyn (B. L.l, Skjotningberg (B. L.l, and Lebesbv 

 (B.L.I; Tana: Berlevaag (B.L.I, Birkestrand (Th. Fr.), and Langnes (B. L.); 

 \'aranger: \'adse (Norm.), Mortensnes (Th. Fr. I, and Langfjordvand (Norm.). 



There is no other Ustieacc more widespread in Norway than Alectoria 

 Jiibata. It is distributed throughout our whole country from the level of 

 the sea to far beyond the tree line. It is especially abundant in subalpine 

 forests where it occasionally entirely covers old trees of Betitla odoj-ata, 

 Picea excclsa and Piiiiis silvcstcr. Less common in Northern Norwav, in 

 Finmark the trees are usually free from pendulous lichens. 



It varies. The type has a smooth surface. But specimens from niari- 

 tiinc rocks, alpine stations, and arctic stations (also corticolousi have a more 

 or less foveolate surface, especially at the angles, a more or less twisted 

 thallus, a more divergent branching, a darker colour though the apices are 

 frequently rather pale, usually — though not always — a shorter and more 

 rigid thallus which is but sparingly sorediate and sometimes quite esorediate. 



This variety may be very different from the type, and it called the 

 attention of Linnaeus who named it Lichen chalybeiforniis Sp. PI. (1753 1 p. 



1155- 



I am quite unable to look upon it as a proper species. My material 

 is large, and it seems to me that there are many transitional stages, espe- 

 cially in plants from Arctic Norwa}'. 



The chalybeiformis is frequent in Norway on the substratum indicated 

 above. 



2. Alectoria implexa (Hoffm.) Nyl. 



Osff. Kornsjo (B.L.I, Prestebakkee (B.L.I, Fredriksstad: Øren (B. L.), 

 LarkoUen (B. L.l, Jeløen (B. L.l. Akcrsh. Asker: Skogumsaasen (B. L.l, 

 Nordmarken very common (B. L.l. Busk. Krokkleven (B. L.), Norderhov 

 ^ Norm. I, Holsvand (B.L.I. 



Vid Selsk. Skr. I. M.-N. Kl. 1921. No. 7 14 



