igi6. No. 8. MONOGRAPH OF THE NORWEGIAN PHYSCIACEAE. 35 



(NORMAN), Ibbestad (LYNGE). It is found on nearly every tree of Alnus 

 incana in the extensive plantations of that tree in Maalselven and Bardo 

 along the rivers (LYNGE). Finmarken: Kautokeino (WAHLENBERG), and 

 Raipas in Alten (ZETTERSTEDT). 



var. subincisa (TH. FR.) LYNGE comb. nov. 



Parmelia incisa FR. STENHAMMAR. lagttagelser rorande Lafvarnes 

 historia och utbredning. Forhandl. vid Skand. Naturf. mote III (1842) 

 p. 614. 



Physcia stellaris a adpressa b. aipolia d subincisa TH. FRIES Lich. 

 Scand. I (1871) p. 140 (ubi syn.). 



According to NYLANDER l FRIES Lich. Suec. 340 belongs to var. 

 subincisa. 



It approaches var. alnophila on account of its short laciniae. It is 

 separated from var. alnophila by still shorter, very rugose, closely 

 contiguous or even imbricate laciniae and an almost crustaceous 

 (placodiiform) habitus. Central laciniae very convex, bullate 

 or papillose. Colour white, lower side also white or pale yellowish- 

 grey, rhizinae of the same colour. 



The specimens are quite fertile, the apothecia are crowded with entire, 

 or at last slightly crenate margin, and pruinose disc. 



Western Norway: Vindellen in Lerdal, at the inner end of the Sogne- 

 fjord, on stone (SOMMERFELT) s. n. Parmelia stellaris ACH. It must be rare in 

 Norway, for it has not been detected elsewhere. 



TH. FRIES saw the plants of SOMMERFELT and identified them with 

 the authentic specimens of STENHAMMAR. Var. subincisa has a distinct 

 positive medullary reaction and belongs to Ph. aipolia, not to Ph. stellaris, 

 as already stated by TH. FRIES. 



STENHAMMAR'S name is a nomen nudum, without description. 



subsp. angustata (NYL.) WAIN. 



Physcia stellaris var. angustata NYLANDER Synopsis (1860) p. 426. 

 Ph. stellaris var. aipolia f. angustata NYLANDER Lich. Scand. (1861) p. in. 



Physcia aipolia f. angustata WAINIO Adjumenta I (1881) p. 136. 



Var. angustata is a delicate plant with linear, very narrow (0,3 

 0,4 mm.) plane, discrete laciniae and small spores. 



Lich. Scand. p. 112. 



