34 BERNT LYNGE. M.-N. Kl. 



and LYNGE), Voss (LID), Reime (LYNGE). From the Trondhjem district: 

 Trondhjem (KINDT), Frosta (JORSTAD). 



In Northern Norway Populus is not frequent as a tree along the 

 coast, but rather abundant in the valleys. Var. anthelina has the same di- 

 stribution: Salten (SOMMERFELT), abundant in Maalselven and Bardo: Moen, 

 Bjernstad, Rostavand, Stremsmo, Indset (LYNGE). In Finmarken only from 

 the interior: Skoganvarre (LYNGE), Karasjok (NORMAN), Polmak (Tn. FRIES), 

 Sydvaranger (HAVAAS). 



Var. anthelina is evidently a more northern plant than var. acrita. It 

 is the more frequent in Northern Norway, whereas the greater part of 

 our Extra-Norwegian material belongs to var. acrita. 



var. alnophila, WAIN. 



Physcia aipolia f. alnophila WAIN. Adjumenta I (1881) p. 136. 



Tab. Ill, fig. i. 



Var. alnophila is a more tender plant with the habitat of Physcia 

 stellaris. The laciniae are short, narrow, contiguous, discrete 

 only atthecircumference, somewhat convex ; they are much dichoto- 

 mously branched and therefore less distinctly stellate. The white dots are 

 only slightly conspicuous. Colour white or greyish-white. Lower side 

 clothed with black rhizinae. 



Apothecia very numerous, sometimes covering the central parts ol 

 the thallus. Disc epruinose, margin entire or (f. crenulata WAIN.) 1 

 crenate. 



It may be mistaken for a coarse Ph. stellaris, but is with certainty 

 distinguished from this species by the medullary reacton (KOH _,. ). In my 

 opinion there is merely a difference of age between var. alnophila and 

 var. crenulata. 



Hab. var. alnophila prefers the bark of Alnus incana, but is also 

 found on other deciduous trees (not Betula\ especially on Salix; very 

 rarely on stone. It is markedly a northern plant, and is only rarely found 

 south of Dovre. 



Loc. In Southern Norway: Bergen (hb. FRIELE), Kongsvold (saxicola, 

 hb. F. KLER). North of Dovre: Trondhjem: Sorgenfri (LYNGE), Steigen 



Adjumenta I p. 136. 



