99 



Group 5 — Plate 5 



Fig. 1. Cetraria fahlunensis, dark olive brown. 



Fig. 2. C. fahlunensis, tip and older branch. 



Fig. 3. C. finastri, olive-green, yellow be- 

 neath. 



Fig. 4. C. pinaslri, tip with yellow soredia. 



Fig. S. C Oakesiana, yellowish green, brown 

 beneath. 



Fig. 6. C. aurescens, pale yellow-green. 



Fig. 7. C. aurescens, tip. 



Fig. 8. C. Fendteri. olive-brown. 

 Fig. 9. C. Fendleri, tip. 



Fig. 10. C. aleurites, whitish, centrally yellow- 

 gray. 

 Fig. 11. C. aleurites, tip. 

 Fig. 12. C. placorodia, pale gray. 

 Fig. 13. C. placorodia, section of spore layer. 

 Fig. 14. C placorodia, spores. 



