I9l6. No. 8. MONOGRAPH OF THE NORWEGIAN PHYSCIACEAE. 53 



Exsic. MALME Lich. Suec. 180. 



Tab. II, fig. 4. 



Differs from var. allochroa in having long, narrow laciniae, 

 which are dichotomously and more divaricately branched, 

 entirely discrete or only contiguous at the apices. Laciniae continuous 

 from the centre to the circumference. Colour deep nut-brown or 

 greyish-brown, moistened greenish. The laciniae may be somewhat shin- 

 ing; they are pruinose, especially at the apices, pruina white or fre- 

 quently with a tinge of violet. Owing to the divaricate branching of the 

 laciniae the thallus is seen resting on a cushion of conspicuous, long, 

 thickly branched, black rhizinae. 



Apothecia not rare, usually pruinose, but often naked (even in the 

 same specimen), with thin usually entire margin, without or (rarely) with 

 folioli. 



Otherwise as in the type and connected with it by innumerable inter- 

 mediate states with shorter, more or less contiguous laciniae. The colour 

 is probably the best criterion. 



Typical states are frequent in Northern Norway mixed with the 

 intermediate states on the smooth bark of Alnus incana along the 

 rivers: Lyngen (Kitdalen, Lulle, and Lyngseidet, LYNGE). Maalselven 

 (Solli, Likkavarre, Stremsmo, LYNGE); from Saltdalen (hb. SOMMERRFELT). 

 Typical states are not frequent in Southern Norway, but intermediate 

 states are often seen. Norderhov (hb. NORMAN), Minne near Eidsvold 

 (LYNGE), near Kristiania (Kolsaas and Leangen, LYNGE). Western Nor- 

 way: Voss (Brynsbro, HAVAAS). 



f. superfusa A. ZAHLBR. 



Physcia pulverulenta f. superfusa A. ZAHLBR. Krypt. Exsic. (1909) no. 

 1670. HARMAND Lich. France (1909) p. 634. 



Tab. II fig. i. 



Differs from var. angustata in having still longer and narrower laci- 

 niae, which are entirely covered by a white pruina; laciniae 

 dichotomously and divaricately branched. 



Specimens from Northern Norway (Stremsmo in Bardo, LYNGE) agree 

 entirely with the authentic specimens of ZAHLBRUCKNER ; they are found 

 on the smooth bark of Sorbus Aucuparia and Alnus incana, associated 



