BERNT LYNGE. M.-N. Kl. 



or (at least in all Norwegian species) occasionally furcate or branched. 

 Asci octosporous, membrane incrassate at the apex. Spores brown or 

 greyish brown, one-septate, ellipsoidical or somewhat fabiform, con- 

 stricted or not at the septum, smaller than in Anaptychia. 



Perifulcrium dark at the ostiolum, otherwise uncoloured or in age 

 darkened, fulcra endobasidial, pycnoconidia short, straight, cylindrical or 

 ellipsoidical. 



Chemical reaction. No colouring by CaCl 2 O 2 . Reaction with 

 KOH important, characteristic of the species. Hymenium in some (few) 

 species persistently blue with J, but usually first blue, then sordid vinous 

 red, or dark red to black. 



Clavis specierum. 



Cortex coloured yellow by KOH. 

 2. Medulla coloured yellow by KOH. 

 3. Thallus sorediate 



4. Thallus brownish or greyish-brown. 



18. Ph. intermedia. 

 4 * Thallus greyish or greyish white. 



5. Laciniae elongate, very narrow (0,2 0,3 mm. broad), 

 lower side uncoloured. 



77. Ph. teretiuscula. 

 5 * Laciniae shorter and broader (0,5 i mm.), lower side 



black. 16. Ph. caesia. 



3 * Thallus not sorediate. 



4. Thallus saxicolous, colour ash-grey. 



79 Ph. me/ops. 

 4 * Thallus corticolous, colour white or greyish-white. 



2. Ph. aipolia. 

 2 * Medulla not coloured by KOH. 



3. Laciniae appressed, not sorediate. 



4. Laciniae with spreading, marginal cilia. 



4. Ph. tenella var. leptalea. 

 4 * Laciniae without marginal cilia. 



/. Ph. stellaris. 

 3 * Laciniae more or less ascending, sorediate at the apices. 



4. Laciniae elongate, narrow, with numerous spreading mar- 

 ginal cilia. 

 5. Laciniae with fornicate apices. 



). Ph. ascendens. 



5 * Apices not fornicate. 4. Ph. tenella. 



4 * Laciniae short, broad, without or only with a few marginal 



cilia. /. Ph. tribacia. 



" Cortex not coloured by KOH. 



2. Thallus more or less pruinose. 



3. Thallus sorediate. p. Ph. grisea. 



3 * Thallus not sorediate. 



