1916. No. 8. MONOGRAPH OF THE NORWEGIAN PHYSCIACEAE. 79 



OLIVIER Lichens d'Europe I (1907) p. 244 (168). HARMAXD Lichens de 

 France (1909) p. 648. 



Thallus isidiate only at the margin of the laciniae. Other- 

 wise as in the type 



f. typica (lithoted). 



Thallus, at least towards the centre, isidiate on the sur- 

 face of the laciniae as well as at the margins. 



Hab. Physcia lithotea prefers depressions of rocks which are fre- 

 quently moistened by the sea and by lakes and streams in maritime and 

 mountainous districts and on mosses which are frequently irrigated. It 

 has never been recorded from wood or bark in Norway. 



Loc. There are few Lichens, which have a wider distribution in our 

 country. It is quite as frequent in Southern as in Northern Norway, on 

 chalk, schistose and hard rocks. Its vertical distribution is less known. 

 At Drebak in the Kristiania-fjord it grows luxuriantly by the shore, sprink- 

 led by the sea water, and in Tromse Amt it is a typical plant of maritime 

 rocks. It is recorded from Drivstuen and Kongsvold on Dovre (900 m. s. in.), 

 Finsehegen (1550 m.), in Western Norway it ascends to the snow limit, 

 in Northern Norway it is recorded from Altevand (500 'm. s. m ), and it 

 will probably be found on the little investigated high mountains in Northern 

 Norway. There is no difference as to the distribution of the different 

 forms, which grow together. 



Abundant near Kristiania, and recorded from numerous stations in Aker, 

 Bserum, and Asker. Frequent in the south-eastern lowlands: Lillestremmen 

 (MoE) Minne (LYNGE), Ringebu (SOMMERFELT), Hadeland (LYNGE). Frequent 

 in the great south-eastern valleys: Tenset and Faemunden (LYNGE), Hunder 

 (HAVAAS), Vaage (Tn. FRIES), Lorn (LYNGE), Listad in Ovrebygden (F. 

 KLER), Hoi (LYNGE); also on the central mountains: Dovre (BLYTT), and 

 Finse (LYNGE). Frequent along the south and west coast: Drebak and 

 Lynger (LYNGE), Moster, Granvin, Eidsfjord and Sundal (HAVAAS). Nord- 

 land: Alstahaug (BLYTT), Saltdalen (SOMMERFELT), and Melbo (NORMAN). 

 Tromse amt: Harstad (NORMAN), Ibbestad, Serreisen, Gibostad, Malangen, 

 Vikran, (LYNGE), Tromse (NORMAN); abundant in the valleys: Maalselven, 

 Bardo, and Skibotndalen everywhere from the coast to the mountains 



