SAPROPHYTISM AND SYMBIOSIS 
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Acacia), secrete a substance which is greatly liked by 
another kind of ants, a smaller, war-like species. These 
ants, attracted by the much-prized food, make their home 
on the tree or in special 'cavities in it, and repel all at- 
tempts of the leaf-cutting species to reach the foliage. 
FIG. 234. Epiphytic group of bromeliads and orchids on a tree, in Cuba. 
(Photo by M. T. Cook.) 
Such trees are called ant-loving (myrmecophylous) , or 
myrmecophytes. 
307. Epiphytism. Any plant (whether parasite or not) 
that lives on another, or upon any other convenient 
support (Fig. 233), is an epiphyte, but the term is com- 
