I9l6. No. 8. MONOGRAPH OF THE NORWEGIAN PHYSCIACEAE. 91 



not so frequently on primitive rocks and eruptives, sometimes on the 

 bark of deciduous trees, but rarely on moss. It is a nitrophilous spe- 

 cies and has a great predilection for wayside curb-stones, walls of stables 

 and the like, and maritime rocks. 



Loc. Very frequent near Kristiania (many stations, M. N. BLYTT, MOE, 

 LYNGE), in Baerum and Asker (LYNGE), frequent in the central lowlands : 

 Sundvolden (HAVAAS), Minne and Tingelstad (LYNGE), Ringebu (SOMMERFELT), 

 Faemunden, Hunder, Naeverfjeld (LYNGE), Gudbrandsdalen (NORMAN), Hoi 

 (LYNGE), from the central highlands : Dovre (many stations, M. N. BLYTT, 

 ZETTERSTEDT, and others), Finse (LYNGE). Most probably frequent along 

 the south coast, though only collected from few stations: Tensberg, and 

 Vasser (LYNGE). In Western Norway it is frequent from the shore to the 

 interior, but it does not frequently surpass 800 m. (HAVAAS); loc. : Raege- 

 fjord, Moster, Kinsarvik and Eide (HAVAAS), Voss (lignicola, LYNGE), Har- 

 dangervidden: Vivheller (HAVAAS), Lygrefjorden and Stat (HAVAAS), Roms- 

 dal (LINDSAY). Frequent about Trondhjem: Ladehammeren (KINDT) and 

 Sorgenfri (LYNGE). Nordland: Saltdalen (SOMMERFELT). North of Salten it is 

 known from innumerable stations, especially along the coast: Rolla, Havn- 

 vik, Gibostad, Kvaleen, Nordbynesset, F10ifjeldet, Mikkelvik, Goalsevarre 

 and Astejok in Tromse amt (LYNGE), and in Finmarken from Alten; 

 Sakkabani (NORMAN) and Storviksnesset (Tn. FRIES), from Porsanger: Hon- 

 ningsvaag, Lakselv and Skoganvarre (LYNGE), from Tanen : Goalsevuoppe 

 (Tn. FRIES), and from Varanger: Naesseby, Mortensnes and Pasvikelven 

 (Tn. FRIES). 



In 1910 I collected a specimen near Gibostad on the island of Senjen 

 in Northern Norway. A part of the specimen was left. In 1911 I visited 

 the place again at the same season, and found that the laciniae had grown 

 as much as i 3 mm. from the surface of the cut. This is a rapid growth 

 for a Lichen. It is probable that nitrophilous species grow quicker, because 

 they are better fed than other Lichens. 



TH. FRIES mentions a Physcia caesia var. albinea 1 (thallus KOH +) 

 from maritime rocks in Northern Norway. This is certainly not Physcia albi- 

 nea (Acn.) NYL. (thallus KOH ). Our only specimen of this belongs to 

 Ph. caesia; it has large apothecia and poorly developed soredia. Such 

 plants are not rare on maritime rocks, as stated by TH. FRIES. The late 

 Mr. LANG saw other specimens, named var. albinea, which belonged to 

 Ph. intermedia WAIN. 



1 Lich. Arct. p. 64. 



