266 



Eduard Riibel 



After trying all the systems published, I have come to prefer 

 the following one, which is an emanation, a continuation of the 

 system of Brockmann-Jerosch and Riibel, of 1912. The entire 

 vegetation of the world can be included ecologically in compre- 

 hensive formation-classes, as follows: 



The formation-classes of the world 



1. Pluviisilvae 



2. Pluviifruticeta 



3. Laurisilvae 



4. Laurifruticeta 



5. Durisilvae 



6. Durifruticeta 



7. Ericifruticeta 



8. Aestisilvae 



9. Aestifruticeta 



10. Hiemisilvae 



1 1 . Hiemif ruticeta 



12. Aciculisilvae 



13. Aciculifruticeta 



14. Duriherbosa 



15. Semper virentiherbosa 



16. Altherbosa 



17. Emersiherbosa 



18. Submersiherbosa 



19. Sphagniherbosa 



20. Siccideserta 

 2i.Frigorideserta 



22. Litorideserta 



23. Mobilideserta 



24. Rupideserta 



25. Saxideserta 



26. Aquerrantia 



27. Solerrantia 



28. Aererrantia 



Rain forests 



Rain scrub 



Laurel-leaved forests 



Laurel-leaved scrub 



Sclerophyllous forests 



Sclerophyllous scrub 



Ericaceous scrub (heaths) 



Summergreen forests 



Summergreen scrub 



Raingreen forests (monsoon forests) 



Raingreen scrub 



Needle-leaved forests 



Needle-leaved scrub 



Hardgrass prairie 



Evergreen grassland (meadows) 



Tall herbage 



Emersed swamp vegetation 



Submersed swamp vegetation 



Moss moor (Hochmoor) 



Dry deserts 



Cold deserts 



Strand steppes 



Wander deserts 



Rock deserts 



Stone (and wood) deserts 



Phytoplankton (water floaters) 



Phytedaphon (soil floaters) 



Phytaeron (air floaters) 



