298 



CYATHEACEAE 



[CH. 



Fig. 560. Cyatlua Inuayana Hook Piece of stem 

 with four leaf-bases, after removal of the outer layers 

 of cortex, seen from without. The margins of the 

 four leaf-gaps, the bundles which spring from them 

 and pass into the leaves, the roots inserted on them 

 (black), and the bundles which run down within the 

 cortex are exposed. The cortical bundles and root- 

 bases are quite free, and the rest are covered by 

 semitransparent parenchyma. (Natural size.) (After 

 De Bary.) 



Fig. 561. Sections of the upper part of the rachis of certain 

 related Ferns, showing various degrees of disintegration of 

 the meristele. A, Alsophila atrovirens; B, Metaxya; 

 C, D, Alsophila Williamsii Maxon. (All x 10.) 



