I92I. No. 7- STUDIES O.N THE LICHEN FLORA OF .NORWAY. 1 43 



11. Parmelia furfuracea iL.i. 



ZoPF investigated this species, and atter chemical and morphological 

 differences he split it up into 5 proper species: Evcniia iPsciidrvcnna) sora- 

 lifcra (Bitter) Zopf, olivrtoriiia Zopf, ccratca (Ach.) Zoi-f, and isidioplwra 

 ZoPF. ' 



I consider the soralifcra a good species, sufficiently characterized by 

 its soredia. The other species are more doubtful. I am indebted to Saxd- 

 STEDE for specimens of them, determined by Zopf himself: 



1. 'Psciidczrniia olivctorifia , one specimen, its medulla is: 'C distincte 

 sed fugaciter rubescens', the reaction K -i- C is more intense and more 

 persistent. 



Zopf sent his oUvctorina to the Krypt. Exsic. Vindob. (No. 1046); 

 Zahlbruckxer reduced it to a subspecies. The medulla is C -^, but inten- 

 sely K + C rubescens. Zopf referred Axzi Lieh. It. sup. No. 71 to oUvcto- 

 rina, the reaction is however exactly the same. 



In accordance with Zopf's diagnosis and his own plant in our herb. 

 I have reserved the name oUvctorina for plants that gave a distinct reaction 

 with C alone. 



As duly remarked by Zopf the oUvctorina comprises plants with nar- 

 row as well as with broad laciniae. The branching is typically dichotomic, 

 only if the laciniae are very broad and ligulate the branching is irregular, 

 approaching to laciniate, at times even coralloid. In most plants the isidia 

 are poorly developed more papillate than coralloid, but quite scobicine plants 

 are not rare. Elexkin made the same observation.- And in his latest publi- 

 cation ZoPF^ also describes and depicts scobicine plants. 



The oUvctorina has a habitus of its own, but I am unable to recog- 

 nize it with certainty without a chemical test, and several plants with tvpical 

 oUvctorina habitus were C -7-, a few also K + C -f-. I cannot regard it 

 a proper species. 



Fertile specimens are not rare. 



2. 'Pscndcvcrnia isidiopliora\ two specimens; Saxdstede writes on the 

 label K(C) -f-, and this is quite correct. 



3. 'Pscndcvcrnia fiirfnracca\ K -f C negative, but at times a faint im- 

 pure brownish colour is seen at the stratum gonidiale. 



4. 'Pscndcvcrnia ccratea\ same reaction as the former species. 



' Zopf. Vergleichende Untersuchungen. Beih. z. Bot. Centralbl. vol. XI\', 1903, p. 95 

 — 126, pi. II -V. 



2 Elenki.n. Zur Frage des Polymorphismus von £"t'(7-;//V7 //rr/;(;Yfcra iL. ( Mann als selbstän- 

 dige Art. Bull. Jard. Imp. St. Petersb. V (1905 t p. 9 — 22 (not seeni. 



3 Zopf. Biol. u. morphol. Beob. an Flechten I. Ber. Deut. Bot. Gesellsch. XXIll ( 1905* 

 P- 497 — 504 pl- XXI. 



