igi6. 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, Beerum, and 

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

 0ier (SOMMERFELT s. n. Parmelia pulverulenta}, 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 Voss (HAVAAS), where many eastern 

 plants occur. 



It is a rare thing to find a quite typical var. pityrea in Norway. 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 (very faintly) yellowish. HARMAND names such plants f. entheroxan- 

 thella, OLIVIER even raises them to specific rank 1 . Yellow soredia occur 

 in all our varieties of Ph. grisea. Lichens quite conformable to HARMAND. 

 Lich. Gall, praecip. 268 (Ph. pityrea var. enteroxanthella HARMAND) are 

 not rare round about Kristiania. 



CROMBIE found the thallus of Ph. virella suffused with chrysophanic 

 acid and accordingly violet with KOH 2 . I found the same on Physcia 

 grisea var. pityrea from Stat (HAVAAS). 



var. detersa, (NYL.) LYNGE comb. nov. 



Physcia pulverulenta var. detersa NYLANDER Synopsis (1860) p. 420. 

 NYLANDER Lich. Scand. (1861) p. no. TH. FRIES Lich. Scand. I (1871) 

 p. 138. 



Exsic. NORRL. et NYL. Herb. Lich. Fenn. 213. 



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

 appressed, short, only at the circumference distinctly 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 sored iate: soredia begin- 



1 HARMAND Catal. Lich. Lorr. p. 231, OLIVIER Lich. Eur. p. 298. 



2 CROMBIE Brit. Lich. I, p. 320 (f. flavescens CROMBIE). 

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



