THE DETEHMIXAriOJf OF LICHENS IN THE FJELB ]o 



14. Th. of bright yellow granules {(/). A]). 



superiieiiil, distiiietlj luargiiiate, yellow (y). 



8p. about 13x5/i Candelariella vitelliiia. 



Th. not formed of bright-yellow granules. 

 Ap. ih immersed, not yellow, margin less 

 distinct. Sp. minute, about 4 X 1'5 /^( Acaiospora. 



15. Th, often present. Ap. usu. dark both 



externally and internally, and with promi- 

 nent proj^er margin Biatorella (Sarcogyne). 



Th. often absent. Ap. often soft, coloured, 

 pale internally and with indistinct i)roper 



margin Biatorella.- 



IG. A]), with thalline margin or with gonidia 



beneath hymenium 17. 



Ap. without thalline margin or without 



gomdia beneath hymeniiun I. ( // ) . 



17. Ap, sunk in the th, (innate). Sp, simple, 



colourless, often large and broadly ellipsoid. 



Algal cells green or reddish 18. 



Ap, superficial or not so distinctly innate. 



Algal cells green 19, 



18. Algal cells yellowish or reddish {Trente- 



polilia). Sp, less than 20/7 Jonaspis. 



Algal cells green, Sp. often much larger ... Aspicilia. 



19. Sp. simple, colourless, often about twice as 



long as broad 21 , 



Sp. septate, colourless, 3-10 times as long as 



broad 27. 



Sp. 1-septate, or polarilocular ; often rather 



less than twice as long as broad 20. 



20. Sp. colourless, polarilocular {P. cJiah/boea awd 



T. varialiUs) Pyrenodesmia. 



Sp. dark, 1-septate Rinodina. 



21. Ap. usu. large (2 or more mm,), S}). large, 



usu. over 40 /z Lecanora (Tartarea group) , 



Ap, usu. small (] mm, or less). Sp, smaller, 



usu, less than 20 /< 22. 



22. Th, usu. ±yellowishC + , K-f yellowish, (If 



the th. is wdiitish the reaction with K is 



yellowish.) On rocks, trees, etc. 



Lecanora (^^aria group, 36-53), 

 Th, and ap. brown to black K— C — . On 



rocks Lecanora (Badia group), 



Th, whitish or greyish (rarely greenish). 



On rocks, trees, etc. K + C— 23. 



23. Th.K-f Yellow 24 



Th, K-', 2(3. 



24. Ap. internally dark with robust violet para- 



ptijses Lecanora atra. 



A p. not internally dark with paraphyses not 



violet 25. 



