1916. No. 8. MONOGRAPH OF THE NORWEGIAN PHYSCIACEAE. 27 



Hab. Physcia stellaris is found on the bark of deciduous trees, 

 especially on Populus tremula and Alnus incana, also on Fraxinus excelsior, 

 Salices, Prunus spinosa etc. I have not seen it on Betula. Also on rocks 

 (chalk), and schistose rocks, very rarely on moss. Physcia stellaris (i. e. 

 var. radiata and var. rosulata) has the same distribution in this country as 

 Ph. aipolia, but it much less abundant. Its vertical distribution is less 

 known. I have not seen it from stations higher than the tree-line, and it 

 is not probable that it ascends higher. The majority of our material 

 belongs to var. radiata. 



Loc. Frequent about Kristiania (M. N. BLYTT and others), and in 

 Aker (LYNGE), Baerum (F. KI^EK), and Asker (LYNGE), also in the south- 

 eastern lowlands: Drammen (Ki^ER), Nordmarken, Minne, Helgeen (LYNGE), 

 Ringebu (SOMMERFELT), Veldre (NORDHAGEN), Brandbu (LYNGE), Toten (SOMMER- 

 FELT), Kongsberg (POULSSON). Frequent in our great valleys : 0sterdalen at Lille 

 Elvedalen (LYNGE), Gudbrandsdalen at Lillehammer (JEBE), Vaagemo and Lorn 

 (LYNGE), Drivdalen (LYNGE), Numedal at Listad (F. KI^ER), in Telemarken near 

 Rjukan (LYNGE). Probably frequent in Southern Norway : Lynger, and Ner- 

 garen in Aamli (LYNGE). According to HAVAAS (in lit.) it is not unfrequent in 

 Western Norway from the coast (Moster) to the inner end of the fjords. 

 Voss (LYNGE), Trondhjem (KINDT), Frosta (JeRSTAo). Northern Norway: 

 Saltdalen (SOMMERFELT), frequent along the coast of Tromse amt: Gibostad, 

 Ramfjorden, Maalsnes (LYNGE), and Tromse (NORMAN), and very abundant 

 in the extensive Alnus- formations in the valleys along the rivers: Maals- 

 elven, Bardo, Lyngen, Nordreisen (LYNGE). It is only recorded from the 

 interior provinces of Finmarken : Luobal (NORMAN), and Skoganvarre (LYNGE) 

 in Porsanger. 



Recorded on rocks (only chalky) from Ibbested and Mestervik in 

 Tromse amt (LYNGE), and on moss from Trondenes in Tromse amt (NORMAN). 



f. tenuisecta TH. FR. in herb. 



Thallus orbicular, minute, diam. 1,52 cm., laciniae very narrow, 

 filiform, irregularly curved, stellate only at the circumference, intri- 

 cately branched, imbricate, grey. 



Recorded from Gudbrandsdalen: between 0ien and Klevstad (TH. 

 FRIES, herb. mus. Upsal.). 



