102 BOTANY ' 
1’. L. Lancaster, B.Sc., photo 
Thick aérial_ roots descending to the earth from rata epiphytic 
onrimu. Note finger-like branch-roots gripping the trunk. 
flax (Phormiwm), and the iris. In rhizome plants, 
the leaf petioles are usually long, and, by lifting up 
the leaf blades to receive the light, do the work 
