I92I. No. 7. STUDIES ON THE LICHEN FLORA OF NORWAY. I 59 



This variety is frequent or even abundant (with the type) on our south 

 coast. According to Havaas it is less frequent on the west coast. At the 

 tjords it is rare, only one specimen recorded from Kristiania (with poorl}^ 

 developed isidial. Not recorded from our inland provinces. 



var. Delisei Dlb. 

 Ho>-(/. Store Kalso (B. L.l, and Lille Kalso (B. L.l. 

 As yet onl\- recorded from these two stations in Norwav. 



var. glomelUfpra (Xvl.i. 



Osf/. Fredriksstad: Kongssten (B.L.I, and Græsvik (B. L.). Akcrsli. 

 Kristiania: Dragonskogen (hb. Somrft.I. Vest/. Yasser (B. L.l. 



Only recorded from a few stations at the Kristiania t^ord. 



I have designated non isidiate plants with negative KOH + Ca Cl, O., 

 reaction as P. prolixa (type), isidiate plants with negative reaction as var. 

 isidiotyla, non isidiate plants with positive reaction as \-ar. Delisei, and 

 isidiate plants with positive reaction as var. glomellifera. I ha\-e seen no 

 authentic specimens of these plants. There is much confusion among licheno- 

 logists on this point, the best thing might perhaps be to introduce new 

 names with clear meaning. 



^-Pannelia isidiotyla was described by Nylander in Flora 1875 p. 8 

 and distributed the same year in Norrl. et Nyl. Herb. Lieh. Fenniae No. 30. 

 Our specimen of this collection does not give any reaction with KOM + 

 Ca Cl, O.,, but Harmand has found a positive reaction in another specimen 

 iLich. France p. 542). We must, therefore, conclude that difterent plants 

 have been distributed under this No. 



I think it therefore the most correct to follow Rosendahl, reserving 

 the name glomellifera for plants with the positive reaction. This evidently 

 agrees with Zwack Lieh. No. 496 [Paniielia glomellifera). This No. was 

 published after 1875 (between 1881 and 1889), but I have been unable to 

 ascertain its accurate date of publication. The name isidiotyla must then 

 be reserved for the plants with the negative reaction. 



The t3'pe of P. prolixa and the isidiotyla are found associated, the 

 isidia cannot be due to climatic causes, as already pointed out by Malme 

 (Stockholmstraktens Parmelia-arter p. 11 81. 1 maintain to have seen transi- 

 tional stages between naked thalli through thalli with small round crenate 

 button-like excrescences and to fully developed isidia; and I have been 

 unable to convince myself of the specific value of this character. I have 

 accordingly referred isidiotyla to Parmelia prolixa as a variety. 



The naked 'Parmelia Delisei' is evidently rare in Norway, and I lia\e 

 only seen one foreign specimen of it (Nylander Pyr. Orient, i). The 



