19 1 6. No. 8. MONOGRAPH OF THE NORWEGIAN PHY5C1ACEAE, 45 



Our (few) Norwegian specimens of var. leftaUa agree with Dalroatinian 

 plants. labelled yPhyscia Uptalea Nyl.< by Zahlbrlckner, only that they 

 are more delicate. 



I am not convinced of the correctness of the synonj-ras of Bitter. 

 but 1 cannot decide the question, not having seen the plants of Acharius 

 and ScopoLi. I have, however, used Bitter's names, for the reason that 

 I agree with him in his view of the species and because the meaning of 

 his names is clear. 



5 Physcia tribacia (Ach.?). 



an s^n. Lecanora tribacia Acharius Lichenographia Universalis (i8io| 

 p. 415. Acharius Synopsis (1814I p. 191. 



Parmelia tribacia Sommerfelt Supplementum Florae Lappon. (1826) 

 p. 109. 



Parmelia ptilverulenta var. dimidiata Arnold Die Lieh, des fränk. Jura. 

 Flora (1864I p. 594. 



Physcia albinea var. dimidiata Nylander Obser\ata lichenologica in 

 P^renaeis orientalibus. Flora (1872) p. 426. 



Physcia [stellaris] trib\r}acia Th. Fries Lieh. Scand. I (1871) p. 140 

 (? Thallus KOHI). Wainio Adjumenta I (1881) p. 135. Wainio Li- 

 chenes in viciniis . . . Pitlekai. Arkiv for Botanik vol. VIII No. IV 

 (1909) p. 68. 



Physcia dimidiata Nylander Addenda nova. Observationes. Flora 

 (1881) p. 537. Dalla Torre et Sarntheim Die Flechten von Tirol (1902) 

 p. 162. Harm.and Lichens de France (1909) p. 626. 



Parmelia dimidiata Arnold Lieh, fränk. Jura Flora 1884, p. 170. 

 Arnold Zur Lichenen-Flora von München. Ber. d. Bayr. BoL Ges. 1. 

 (1891I p. 33. 



Exsic. Arnold 272 {Parmelia pulvent/eftta Schreb. var. gnsea Lam.), 

 1367 {Parmelia dimidiata Arn.) Malme Lieh. Suec. 156 {Physcia tribacia 

 (AcH.) Nyl.). 



Tab. II, fig. 3. 



Harmand and other lichenologists distinguish between Ph. dimidiata 

 Nyl. Flora 1881 p. 537, and Ph. tribacia Nyl. Flora 1874, p. 307. the 

 former species having a »cortex inférieur à hyphes grêles, dirigés géné- 

 ralement dans le sens de la surface et ne se distinguant guère de la couche 



