32 



BERNT LYNGE. M.-N. Kl. 



var. (Xcrita (Ach.) Wain. 

 Ind. var. cercidia (Ach.). 



Partnelia alpolia a acrita Acharius Lieh. Univ. (i8io) p. 477. Som- 

 merfelt Suppl. Fl. Lapp. (1826) p. III. 



Plivscia stellaris a adpressa b. aipolia a ncrila et ß cercidia Th. Fries 

 Lieh. Scand. I (1871) p. 139. Ph. stellaris var. acrita et var. cercidia 

 Nylander Lieh. Scand. (1861) p. iii. 



Physcia aipolia var. acrita (vel cercidia) \Val\io Adjumenta I (1881) 

 p. 136. Crombie Brit. Lieh. I (1894) P- SM- Harmand Lieh. France 

 (1909) p. 619. 



This is a coarse plant of a habitus approaching to Ph. pulverulenta 

 var. allochroa. The laeiniae are contiguous, rather short and 

 broad, and usually' of a slightly darker colour than var. atithelina. At the 

 circumference they are plane, in the centre with wrinkles lengthways of 

 the laeiniae, more or less rugose, and furnished with many small secondary 

 laeiniae. Lower side pale or dark. 



The disc of the apothecia naked or pruinose, margin entire or 

 crenate, 



I can see merely a difference of age between var. acrita and var. 

 cercidia; var. cercidia has a dark lower side and crenate apothecia. Cre- 

 nate apothecia are decidedly a mark of age, and the colour of the lower 

 side is a very variable character in the genus. 



Hab. Found on the bark of deciduous trees, especially on Populus 

 iremula. — It has not yet been reported from Finmarken, otherwise it has 

 the same distribution as var. anthelina. 



Loc. Very abundant about Kristiania and known from numerous 

 stations in Aker, Baerum, and Asker (hb. M. N. Blytt and others). Fre- 

 quent in the southeastern lowland: Veldre (Nordhagen), Toten (Sommerfelt), 

 Norderhov (Norman), Brandbu, Minne, and Vestfjorddalen (Lynge). Frequent 

 in Southern, most probably also in Western Norway and in the Trond- 

 hjem district: Aas and Drebak (Lynge), Drammen (hb. M. N. Lund), 

 Skien (Hoch), Lyngør (Lynge), Voss (Lynge), Granvin (Havaas), and 

 Frosta (Jørstad). 



Northern Norway: Salten (Somft.). Frequent in Tromsø amt in the 

 valleys as well as along the coast on the bark of Ahms and Populus: 



