70 



GENERAL REVIEW OF THE OROHIDE.T:. 



parenchyma and parenchymatous tissue composed of thiu-walled cells. The ' 

 details of the minute strufture of the roots of orchids are Avell shown 



Fig. 14. Fragments of transverse sections of the young stem of ]'nnda tricolor. 



A, near the apex, with one layer of epidermal cells only. B, lA inch below A, showing epidermis with two 

 layers of cells and the commencement of the formation of corky tissue. 



1, epidermis ; 2, corky tissue developing from fundamental tissue ; 3, fundamental tissue 

 4 and B, bast-like cells ; ."., fibro- vascular bundles. 



Fig. 15. Fragment of transverse section of older portion of stem of I'anda tricolor with (2) corky tissue well 

 developed. 4, isolated bast-like cells. 



in the accompanying sections selected from genera in different Tribes, 

 and which may be regarded as fairly representative types of each. 



