igi6. Xo. 8. MONOGRAPH OF THE NuKWEGIAN PHYSCIACEAE. 39 



Reaction: Cortex slightly yellow by KOH, medulla uncoloured, 

 no colouring by CaCLOo. Hymenium persistently blue or bluish-black b}' J. 



Hab. On the bark of deciduous trees, espe- 

 cially in avenues and trees in open situations, 

 very rarely on rocks (moist Atlantic climate in 



Western Xorwavi. It has a great predilection for 



^ ^ Fig. 5. Physcia 



the thin twigs of Prunus spiiiosa, wild Ribes ascendens Bitter. 



rubrum and the like along the coast. 



Loc. Physcia asceiuietis belongs to the southern lowlands and is not 

 recorded north of Trondhjem. It is frequent about Kristiania: Tøien, 

 Hovedøen, Ekeberg (Moe), Hovik, Blommenholm (Kiær), Skogumsaasen 

 (Lynge), also in the south-eastern lowlands: Nitedal (Moe), Heland (Lynge), 

 Sundvolden (Havaas and Lynge), Minne, Hersjøen, Brandbu I Lynge), 

 Veldre (Xordhagen). Xot (yet) recorded from our great south-eastern 

 valleys. Frequent along the south and west coast: Haaeen (Blytt), Hvaler 

 (Lynge), Larvik (Blytt), Moster (Havaas and Lynge, at Moster also 

 sax i col ou s), less frequent towards the inland end of the western fjords 

 (H.AVAAS in lit.); \'oss (Havaas). Trondhjem: Ladehammern (Kindt). Xot 

 recorded north of Trondhjem. 



4. Physcia teneJIa, (Scop.) emend. Bitter. 



Lichen tenellus Scopoli Flora Carniolica ed. 2 a (1772) p. 394. 

 Physcia tenclla Bitter Leber die \'ariabilität einiger Laubflechten 

 (1901I p. 431 et 432 fig. 2. 



The SN'nonymy of this species is very intricate and the priority cannot be 

 decided without a study of the authentic specimens of early authors. I 

 have not seen the Physcia tenclla of Scopoli. In naming the species 

 Bitter does not argue from a point of priorit}-, but from morphological 

 views (»Durch die genannten Eigenschaften ist der Artname der beiden 

 Eichenen begründet«). A full list of uncertain synonyms will make bad 

 worse. 



Exsic. Claud, et Harm. Lieh. Gall, praecip. 128, Floerke Deutsche 

 Lieh. 73, Flotow Lieh. Exsic. 90 B and 90 Bb (at least in our herb., s. n. 

 Parmelia stellaris fornicata Wallr.), Havaas Lieh. Xorv. 336 (near Ph 

 leptalea), Norrl. et Xyl. Herb. Lieh. Fenn. 216 {Physcia stellaris * tenella 

 f. subbrci'iata Xyl. in lit.), Rchb. et Schub. 37, Stenhammar Lieh. Suec. 

 212 inf {Par ine Ha cacsia\. 



