1916. No. 8. MONOGRAPH OF THE NORWEGIAN PHYSCIACEAE. 57 



and constrictedly septate; they are undivided, or sometimes with few short 

 branches at the exterior part. The asci vary: long and narrow (90 125/4 

 long, 1822 [i broad), or short and broad (80 90 X 27 30 //), 

 always octosporous. Spores obliquely biseriate more or less unto 

 very constricted at the septum, rounded, rarely slightly apiculate at the 

 ends, cell room rounded or rarely angulose, diaphragma thin in ripe spo- 

 res. Spores narrower than in Ph. pulverulenta: The breadth is 

 seldom larger than half the length: (19) 22 29 (33) /t long, 

 10,5 1 4>6 (i6);U broad. 



Pycnides are not frequent; they are easily overlooked owing to the 

 entirely uncoloured perifulcrium. They are globose with a slightly pro- 

 minent ostiolum. Pycnoconidia straight, cylindrical, rounded at the ends, 

 3,5 5 long. 



Reaction. Cortex and medulla uncoloured by KOH as well as by 

 CaCl 2 O 2 . Hymenium persistently blue with J. 



Hab. Physcia muscigena is found on mossy rocks, especially in al- 

 pine positions, also on bare stone. It prefers schistose or chalky substra- 

 tum. In Southern Norway it descends to the sea level only on such 

 substratum; in Northern Norway it is equally frequent at all elevations. 



Loc. Near Kristiania: St. Hanshaugen (MoE, 1866, now destroyed, 

 and Snareen (LYNGE) on silurian strata near the sea. Central lowlands not 

 frequently: Ringebu (SOMMERFELT), south-eastern valleys very frequent along 

 the elevated valleysides and on the mountains: Tenset (LYNGE), Otta 

 (HAVAAS), Vaage (SOMMERFELT), Lorn (NORMAN), Otta (Tn. FRIES), Slidre 

 (SOMMERFELT); it is also very frequent along the central high mountains 

 from Dovre (several loc., SOMMERFELT, M. N. BLYTT, LAUDER LINDSAY, 

 and others) over Finse (LYNGE) to Hardangervidden (several loc., HAVAAS). 

 Not known from the lowlands of Western Norway, not found in Granvin 

 in Hardanger (HAVAAS), but frequently on the western mountains (HAV- 

 AAS). Recorded from Sundalen (several loc., HAVAAS). There is only one 

 station in the poorly explored Trondhjem (Drontheim) district, Ladeham- 

 mern, on moss (KINDT); not recorded (but certainly present) from Southern 

 Nordland, which has been still less investigated. North of Salten (SoM- 

 *MERFELT) it is frequent in suitable places, evidently more frequent or 

 perhaps better explored along the coast than in the interior: Tromse 

 amt along the coast: Gibostad, Malangen (LYNGE), Fleifjeld (HAVAAS), 

 Skjaerve (NORMAN), in the interior: Sollitind (LYNGE); Finmarkens amt: 



