84 BERNT LYNGK. M.-N. Kl. 



Physcia tremulicola is separated from Ph. sciastrella NYL. by its linear, 

 very narrow laciniae, appressed to the substratum, at least at the circum- 

 ference of the thallus. 



There is a difference in colour between the plants from Dovre and 

 Vaage on the one hand, and those from Hakedalen on the other. The 

 former ones agree entirely with the authentic specimen of NYLANDER, and 

 with NORRL. and NYL. Herb. Lich. Fenn. 217, the latter are black. We 

 may describe them as follows: 



f. typicsi. 



Thallus olivaceo-fuscus, subtus concolor. 



Recorded from Dovre (ZETTERSTEDT, the authentic specimen of NY- 

 LANDER, hb. mus. bot. Upsal.), Vaage: Presteberget (HAVAAS). 

 Exsic. NORRL. et NYL. Herb. Lich. Fenn. No. 217. 



f. atra n. f. 



Thallus ater, subtus concolor. 



Known from Hakedalen, near Kristiania, on old Populus tremula. 



Exsic. HAVAAS Lich. Norv. (inedited). 



There is no other difference between the two forms, which perhaps 

 only represent individual variation, or difference of age. 



14. Physcia endococcina (KBR.) TH. FR. 



Parmelia endococcina KOERBER Parerga (1865) p. 36. 



Physcia endococcina TH. FRIES Nya Skandin. Lafarter. Bot. Not. 

 (1866) p. 150. GLUCK Morphol. der Flechtenspermog. Verh. Naturh. Mediz. 

 Vereins zu Heidelberg vol. VI N. F. (1899) p. 147 (67) fig. 39, Tab. II, 

 fig. i. 



Physcia obscura var. endococcina TH. FRIES Lich. Scand. I (1871) 

 p. 143. NYLANDER De gonidiis etc. Flora (1877), p. 354. LEIGHTON Lichen- 

 Flora (1879) p. 142. HAVAAS Floristiske undersegelser. Berg. Mus. Aarb. 

 (1897), no. Ill, p. 10. DALLA TORRE et SARNTHEIM Die Flechten von Tirol 



