VI 



The Web of Life 



99 



tische Vegetation Amerikas (Jena, 1888) should be com- 

 pared. Gcebel discusses, for instance, the various ways 



FIG. 5. Elk's-horn fern (Platycerhim grande) . (After Burbidge.) 



in which the epiphyte effects attachment to its bearer, 

 usually by a special disc with root - suckers, some- 

 what similar to that in mistletos. The spongy rind of 

 Aroids and Orchids is regarded as primarily an organ of 



