I9l6. No. 8. MONOGRAPH OF THE NORWEGIAN PHYSCIACEAE. 99 



var. Wahlenbergii LYNGE comb. nov. 

 Tab. I, fig. i. 



Syn. Physcia Wahlenbergii Lynge. Neue Flechten aus Norwegen. 

 Berg. Mus. Aarbok (1912), no. 10, p. 7, tab. I, fig. i. 



Thallus major subcrustiformis, sorediis confluentibus fere tec- 

 tus, laciniae breviores, vulgo indistinctae. 



Loc. Found along the shore of Northern Norway, but not frequently. 

 Tromse amt: Tromse and Nordbynesset (LYNGE). 



Dr. WAINIO was kind enough to send me a specimen of Ph. intermedia 

 for comparison. As stated by WAINIO his specimens have the habitus of 

 Ph. stellaris. The medullary reaction in his specimens is next to 

 imperceptible, as is also the case in some of mine; in others, however, the 

 reaction is more distinct. Owing to the very narrow laciniae the medullary 

 reaction is not easily perceptible. Sections always give faint reactions. 

 I removed the upper cortex and observed the reaction directly on the 

 plant under the microscope. Old specimens, especially the var. Wahlen- 

 bergii, have more the habitus of Ph. caesia. In my opinion Ph. intermedia 

 belongs to the Ph. caesia tribe. 



It is separated from Ph. caesia by its colour and by the form of the 

 soredia. Plants growing in the shade are brighter of colour; if they have 

 sorediate apices, they may be confounded with Ph. tribacia, from which 

 species they are separated by the positive medullary KOH-reaction, and by 

 narrower laciniae. Inexperienced investigators might confound it with 

 sciastra- states of Ph. lithotea, but all other differences apart, Ph. lithotea 

 is KOH 



My Ph. Wahlenbergii is so different from WAINIO'S description that 

 it was described as a n. sp., but a large material, and observation in 

 nature have now shown me intermediate states. The difference is, how- 

 ever, so great that it is impossible to regard them as mere synonyma. It 

 will be natural to describe them as two varieties of the same species. 



19. Physcia melops (Our.) NYL. 



Parmelia melops DUF. (according to NYLANDER Addenda nova 1. c.). 



Physcia melops (DuF.) NYLANDER, Addenda nova. Flora 1874, p. 16. 

 CROMBIE Brit. Lich. I (1894) p. 315. NYLANDER Lich. Paris (1896) p. 42. 

 Du RIETZ Lich. anteckn. (1915) p. 4. 



