79 
Origin and Development of the Composites. 
The plumose seta by the fusion of the lateral cilia in the same way 
as in the serrulato-paleaccous type gives rise to the plninoso-paleaceous 
Pappus Foums in the Composite. 
Fig. 17. Below each figure of the surface view a tranverse section is 
given in most cases. The individual setae are outlined by heavy lines ; the 
constituent hairs are indicated by thin lines, in some cases only in part for 
clearness.—A. setose scabrid ; B. simple setose; C. serrulato-setose; D. 
barbellato-setose ; E. plumoso-setose; F. paleaceo-setose; G. aristato- 
paleaceous; H. serrulato-paleaceous ; I. simple paleaceous; K. flmbriato- 
paleaccous ; L. setoso-paleaceous ; M. plumoso-paleaceous ; N. fimbriato- 
coroniform ; O. aristate; Pa-Pb. barbato-aristate; Qa. coroniform ; Qb. 
auriculato-coroniform ; R. aristato coroniform. 
