162 Mr Yapp , On Plants from the Malay Peninsula. 
two curious epiphytic Ferns, Lecanopteris carnosa, Blume, and 
Polypodium sinuosum, Wall. 
The stems of Lecanopteris form a thick crust, often 3 or 4 feet 
long and a foot or more thick, on the branches of trees. This 
Fern grows only on mountains of a considerable height; while the 
smaller Polypodium is found creeping on tree-trunks, often very 
little above sea-level. 
Both of these remarkable Ferns may be classed amongst the 
so-called ‘ myrmecophilous ’ plants, as they agree in possessing 
thick, fleshy rhizomes, which, except in the very youngest parts, 
contain numerous hollows in the form of continuous galleries, 
which are invariably inhabited by colonies of ants. 
These galleries are formed in both cases by the breaking 
down of a large-celled, thin-walled tissue, and are not excavated 
by the ants themselves, though the latter do occasionally tunnel 
out short passages leading from the galleries to the exterior. 
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