1916. No. 8. MONOGRAPH OF THE NORWEGIAN PHYSCIACEAE. 67 



character of sufficient importance to separate var. Icncokiptcs from PJi. 

 grisea and to refer it to Fh. pulvendetUa . I do not agree with this view. 



In some of the Norwegian specimens the white colour has been 

 preserved over the whole lower face, in others there is a marginal un- 

 coloured zone, whereas the central part is dark. The rhizinae are first 

 coloured, then the adjacent part of the lower cortex, and at last the dark 

 spots become confluent. 



AcHARius did not attribute much importance to the colour of the lower 

 cortex. His Pannelia farrea a ^ is »subtus albido fibrillis fusconigris« and 

 his var. ß alpliiphora of the same species is »subtus atro-tomentoso«:. In 

 realit}- its cortex is also black, - — Harmand is also doubtful, for his f. 

 bnmnea- has a »face inférieure largement pale, ce n'est que vers la base 

 qu'apparaît le brun ou le brun-noirâtre-, a very correct observation. 



Aftêr Hue and H.armand there would be many parallel varieties of 

 Ph. pulveriilenta and Ph. grisea, for almost every one of the Ph. grisea varie- 

 ties here described has specimens with more or less darkened lower face. 



It seems to me that such characters are not suited to separate between 

 different species. We shall have a more natural arrangement, if we refer 

 sorediate varieties to Ph. grisea and esorediate varieties to Ph. pulvcnilcnta. 

 The latter species always has a black lower face, the former a variable 

 colour, in some varieties an entire!}- — or at least partly — black lower 

 side, in others an uncoloured one. 



var. detersa is here limited to chestnut or brown plants with a black 

 lower surface. Harmaxd's var. leucoleipies also comprises plants with 

 whitish pruinose laciniae. 



var. semi farrea (Wain.) Lynge comb. nov. 



Physcia (pulvcndenta) * * farrea Acharius f. semifarrea Wain. Adju- 

 menta I i^i88i) p. 132. 



Physcia pulvendenta var. leucoleipies f. bnmnea Harm. Lieh. France 

 U9091 p. 636. 



Ex sic. NoRRL. et Nvl. Herb. Lieh. Fenn. 214. [Ph. muscigcna Ach. 

 var. 5f ;«//W;vra Wain. ). Cl.\ud. et Harm. Lieh. Gall. 494 (s. n. Physcia pid- 

 vendenta var. leucoleipies f. brnnnca Harm.). Fries Lieh. Suec. 294. yPann. 

 p'.tyrea farrea]. 



^ Lieh. Univ. p. 475. 

 -^ Lieh. France p. 636. 



