1 92 1. No. 7. STUDIES OX THE LICHEN' FLORA OF NORWAY. I7I 



France p. 563), but ' PanncUa saxaiilis a. Iciicocliroa niiiiida Schaer', 

 ScHAERER Lieh. Hclv. no. 362, belongs to Paruulia sulcata. PanucUa 

 saxatilis is more iVequentl}' very isidiose, the isidia sometimes cover the 

 whole central part of the thallus (f. furfnracca Schaer.). In Norway f. fur- 

 fiiracca is the most common modification. Ever}- transitonal stage between 

 the two forma is found, the names only represent extremes of the variation 

 of the species. 



The colour varies from pale greyish, almost white, to a dark greyish 

 brown, but it seldom offers the brownish-black or purplish-black tinges, 

 so characteristic of Parmelia omphalodcs typica. 



It is unnecessary to point out the well-known macroscopical characters 

 which separate PanucUa saxatilis from Paruiclia sulcata as distinct proper 

 species, but attention is called to the thicker h3'menum of PanucUa saxatilis. 



35. Parmelia fraudans Nyl. 

 Map IX, 4. 



Akcrsli. Nordby (B. L.). Busk. Holsvandet (B. L.), Gjeilo: Budalen 

 (B. L.). 



Hrd. Elverums Leir (B. L.), Lille Elvedalen (B. L.), Helgoen (B. L.), 

 \'eldre (Nordh.). Opl. \'aage c. fr. (hb. Somrft.), Valbykampen c. fr. (B. L.), 

 Brandbukampen (B. L.). 



Sort)'. Dovre: Drivstuen (B. L.), and Vaarstien (B. L.); Fæmunden: 

 Langen (B. L.). 



Tronis. Maalselven: Mestervik (B. L.), Bardo: Stromsmo (B. L.), Innset 

 (B. L.), and Altevand common (B. L.); Lyngen: Skibotn (B. L.), and Lulle 

 (B. L.). Fiiiiu. Alten: Kobbenesset (B. L.), Øskarnes (B. L.), Sakkobani 

 (B. L.), Bosekop (B. L.), Konsamfjell (B. L.), Store Raipas (B. L.), and 

 Rautasvarre (B. L.); Porsanger: Lakselv (B. L.), and Skoganvarre (B. L.); 

 Karasjok: Dakteroavve (B. L.); Tana: Lævajok (B. L.), and Tanagaard (B. L.); 

 Varanger: Aid (B. L.). 



f. caesiopruinosa n. f. 



Thallus caesiopruinosus. 



Pruinose specimens of P. fraudans are very rare, only one sterile 

 specimen recorded, from Sakkobani in Kaafjord, Finmarken. — 



The KOH-reaction of the medulla is faint: first yellow, then orange- 

 coloured. 



See P. omphalodcs f. caesiopruinosa. 



Parnu'lia fraudans is a good species. It was neglected by all former 

 collectors in Norway, in 187 1 Th. Fries was unaware of its existence in 

 this country. In reality it has a wide distribution in Norway. I have 

 found it in Finmarken and Tromso almost evervwhere in the continental 



