ICSI. No. 7. STUDIES OX THE LICHEN' FLORA OF NORWAY. 227 



Vest/. Tonsberg: Feyenland IB. L.l, Larvik: Tjolling (HoegI, Stavæni (Noral). 

 Busk. Opkuven (B.L.), Lier: Enger (B. L.), Hoi: Odnak (B. L.). 



Tch'in. Haukeligrænd (Seeland), Borteheia (Seeland). Aiistagd. Lyngor 

 frequent (B.L.I, xVanili: Nergaren (B. L.l. J^esfagd. MandaL Risebank (B. L.). 

 Rog. Rægetjord (H.). 



Hard. Skaane\ik: IMarkhussæter (Holmboe), \'oss frequent (B. L.l, 

 Strandebarm (Lillef.), Manger (H.). Sogn. Stat: Svarthorn (H.l. 



Hed. Matrand (B. L.), Kongsvinger (B. L.), S. Odalen: Sander (B. L.|, 

 Solør: Haslemo (B. L.), Hanestad (B. L.); Helgoen (B. L.). Opl. Lilleham- 

 mer: Mesnafossen (B. L.), Hunder (B. L.); Lunner: Sylvtjernhøgdene (LidI, 

 Hadeland: Valb3'kampen (B. L.), and Wlnuinden (B. L.); Land: Trevand 

 (,B. L.), and Roen (B. L.l. 



Sortr. Drivdalen, ad plicafani (hb. M. N. Bl.I. 



Nordl. Ofoten: Evenes (Norm.). 



L'siica harbata is a lowland plant from our forests of coniferous trees 

 [Picea, Piiiits], also on Bctiila, and occasionally on other deciduous trees. 

 On the coast it has been recorded on the thallus of large Panncliac, on 

 the west coast it is common on rocks, otherwise not. — Not recorded 

 north of Lofoten. 



Its vertical distribution is insufficiently known, it rapidly disappears in 

 subalpine torests, in Granvin (Hardanger) it frequently ascends to 350, and 

 rarely to 5 — 600 m. s. m. 



Apothecia are very rare in Norway. 



Usnea harbata is frequent, in places abundant, but in Eastern Norway 

 by far less abundant than Alectoria sarnientosa, in Western Norway the 

 latter plant is less common. 



It has been suggested that anatomical characters (the relative thickness 

 of axis and thallus) should offer good distinguishing characters between U. 

 barbata and U. plicata. I cannot confirm this: 



I select the following measurements : 



Usnea plicata. Usnea barbata. 



Axzi It. sup. Arnold 910 



(near the basis). (near the basis) 



Diam. of thallus 1360 — 1525 \i- 850 — iioo [x 



1^ „ axis 500—510 [J. 560 [J. 



Thickness of cortex 30 — 40 [j. 65-80 [j. 



Kerner 3517 \i 

 (near the basis! 



Diam. of thallus 850 — 1200 [x 



" axis 375 1^- 



Thickness of cortex 50 — 80 [j. 



