I9l6. No. 8. MONOGRAPH OF THE NORWEGIAN PHYSCIACEAE. 4! 



React. Cortex faint yellow by KOH, medulla unaltered, no colou- 

 ring with CaCl 2 O;3. Hymenium intensely and persistently blue with J. 



Hab. On the trunks of deciduous trees, especially in open situations 

 (avenues &c). One of the few Physciae which is frequently found on 

 Retula. Also found on old wood (fences &c), and (rarely) on stone. 



Loc. Physcia tenella is a lowland species, but not confined to the 

 southern lowlands. It has been recorded as far north as Alten and Tromse 

 (miserable specimens), and in luxuriant specimens as far north as Bode. 

 It has not been recorded from the more continental districts of our 

 country (the south-eastern valleys, in the s. e. lowlands only from Minne 

 near the great lake Mjesen. It is therefore evidently a coast species. 

 Many phanerogamous plants also have the northern limit of their conti- 

 nuous distribution about Lofoten, e. g. Anemone Hepatica, Narthecium 

 ossifragum and Blechnum Spicant. 



Physcia tenella is very frequent or even abundant about Kristiania: Teien, 

 Nitedalen (MoE), Hakedalen, Bryn, Baerum, and (the lower parts of) Nord- 

 marken (LYNGE). Minne (LYNGE). Frequent along the south and west 

 coast and fjords: Hvaler, and Sandefjord (LYNGE), Larvik (NORMAN), Lynger 

 (LYNGE), Moster (HAVAAS and LYNGE), Fane at Stend (HAVAAS), Strandebarm 

 (LILLEFOSSE), Granvin: Havaas (HAVAAS and LYNGE), also at Voss (HAVAAS). 

 Abundant about Trondhjem: Stjerdalen (SOMMERFELT), Ladehammern and Us- 

 viken (KINDT), Sorgenfri (LYNGE), Frosta (JeRSTAo), Namsos (MALMGREN). 

 Nordland : Bode (SOMMERFELT). I have searched for it in vain in Tromse amt, 

 but there is a specimen from Tromse in our herbarium (NORMAN). Fin- 

 marken: Bjernstad in Alten (hb. NORMAN). 



var. marina (E. NYL.) LYNGE comb. nova. 



Lichen tenellus ft WAHLENBERG Flora Lapponica (1812) p. 435 (I have 

 seen his specimens from petris denudatis prope littora maris, but not 

 from parietibus ligneis). 



Physcia stellaris var. marina E. NYLANDER Alands Laf-vegetation 

 (1857) P- 86. 



Physcia stellaris var. subobscura NYLANDER Ad vegetationem Helsing., 

 Savol. et Alandiae addenda (1858 1859) p. 239. NYLANDER Lich. Scand. 

 (1861) p. in. NYLANDER Synopsis (18581860) p. 426. CROMBIE Brit. 

 Lich. I (1894) p. 311. KNOWLES The Marit. and Marine Lichens of Howth 

 (1913) p. 125. 



Physcia caesia * leptalea TH. FRIES Lich. Arct. (1860) p. 65. 



