1916. No. 8. MONOGRAPH OF THE NORWEGIAN PHYSCIACEAE. 65 



Loc. It is a plant from our south-eastern lowlands, not recorded north 

 of Dovre: Near Kristiania it is frequent: Bryn, Bygde, Bærum, and 

 Asker (several, stations, Lynge); Minne near Eidsvold (Lynge), Toten and 

 Øier (Sommerfelt s. n. Parwelia puho-ulenta), Vestfjorddalen in Telemarken 

 (Lynge), Sell in Gudbrandsdalen (Havaas). It is very rare along our 

 western coast (only from Dalsbe on Stat, Havaas); in Western Norway 

 it is otherwise only known from \'oss (Havaas), where many eastern 

 plants occur. 



It is a rare thing to find a quite typical var. pityrea in Norwa}-. Usually 

 the lower cortex is more or less dark towards the centre. Hue and Har- 

 MAND would refer the greater part of our material to var. leucoleiptes 

 Tuck. 



The soredia are either white or quite as frequently yellowish, and 

 in that case more distinctly yellow by KOH. The medulla is also some- 

 times (ver\' faintly) yellowish. Harmand names such plants f. entheroxan- 

 thella, Olivier even raises them to specific rank^ Yellow soredia occur 

 in all our varieties of Ph. grisca. Lichens quite conformable to Harmand. 

 Lieh. Gall, praecip. 268 {Ph. pityrea var. cnlcroxanthella Harmand) are 

 not rare round about Kristiania. 



Crombie found the thallus of Pli. virella suffused with chr^'sophanic 

 acid and accordingly violet with KOH-. I found the same on Physcia 

 grisea var. pityrea from Stat (Havaas). 



var. detersa. (Nyl.) Lynge comb. nov. 



Physcia pulvonlenta var. dctersa Nylander Synopsis (i860) p. 420. 

 Nylander Lieh. Scand. (1861) p. no. Th. Fries Lieh. Scand. I (1871) 

 p. 138. 



Exsic. NoRRL. et Nyl. Herb. Lieh. Fenn. 213. 



Thallus middle-sized or larger, diam. up to 8 — 9 cm. Laciniae 

 appressed, short, only at the circumference distincdy stellate. They 

 are closely contiguous or imbricate, multifid, the narrower ones pin- 

 nate, the broader ones widened at the ends like a fan and coarsely 

 crenate or digitate. Thallus smooth, opace or slightly shining at 

 the circumference, without isidia, but sorediate: soredia begin- 



1 Harmand Catal. Lieh. Lorr. p. 231, Olivier Lieh. Eur. p. 298. 

 - Crombie Brit. Lieh. \, p. 320 (f. flavesccns Crombie). 

 Vid.-Selsk. Skrifter. L M.-N. Kl. 1916. No. 8. 



