54 BERNT LYNGE. M.-N. Kl. 



with var. angtistata. Less pruinose states, intermediate between f. siiper- 

 fusa and var. angnstata, are known from Minne near Eidsvold and Kols- 

 aas near Kristiania (Lynge). — It has a wide distribution : Crimea 

 (Mereschkowsky), Steiermark (Zahlbruckner), France (Harmand), and 

 Norwav. 



var. argyphaea (Ach.) Nyl. 



Farmelia piilvenilcnta var. argyphaca Acharius. Lieh. Univ. (1810). 

 p. 474, Synopsis (1814) p. 214. 



Parmelia pulverulenta var. argyphaca Nylander Lieh. Scand. (1861) 

 p. 109. Th. Fries Lieh. Scand. I (1871) p. 137. Crombie Brit. Lieh. 

 (1894) p. 306. Dalla Torre et Sarntheim Die Flechten von Tirol (1902) 

 p. 156. Olivier Lieh. d'Eur. I (1907) p. 236. Harmand Lieh. France 

 (1909) p. 634. 



Exsic. Anzi Lieh. Ital. sup. 122 (not 123 »var. argyphaca f. polita 

 Flw.«). Schaer. Lieh. Helv. 356 (s. n. Parmelia pulverulenta a allochroa 

 a. corticola Schaer.). 



Differs from var. allochroa in having firmer closely imbricate, short 

 laciniae with widened apices, and especially by the entirely albo-prui- 

 nose thallus and apothecia. 



I have seen entirely milk-white specimens from Southern Europe. No 

 such specimens have hitherto been detected in Norway, but several of the 

 «//oc//roa-specimens approach it closel3\ A fertile muscicolous spe- 

 cimen from Lyngseidet in Northern Norway (Lynge) apparently belongs to 

 f argyphaea; its exterior approaches Ph. nutscigcua, but the chemical 

 reaction of the hymenium is »J first blue, then immediately sordid 

 vinous red«. — 



f. venusta (Ach.) Nyl. 



Parmelia vemista Acharius Methodus (1803) p. 211, et tab. VIII, fig. 5, 

 Lieh. Univ. (1810) p. 475. 



Physcia venusta (Ach.) Nyl. Dalla Torre et Sarntheim Die Flechten 

 von Tirol (1902) p. 157. 



Physcia pulverulenta var. venusta. Nylander Prodromus (1857) p. 308. 

 Synopsis (1858—60) p. 421. Lieh. Scand. (1861) p. no. Th. Fries Lieh. 

 Scand. I (1871) p. 138. Hue Lieh. Exot. (1892) p. 112 (as subspecies). 



