36 THE TRANSVEKSE SECTIONS OF PETIOLES OF EDCALYPTS 



19. E. tereticornis, Smith ; flooded gum-tree. 



Tree, — Tall, handsome, seldom exceedmg 100ft. in height. 



Leaves. — Equally green on both sides. 



Size of Section. — About | line broad by J line thick, or 1\ times broader than 



thick. 

 Outline of Section. — Irregularly round to oval. 

 Epidermis. — Thickness, i in. 



Breadth, g^^ - j^ in. 

 Cortical Cavities.— ^^ in., round to oval, numbering from 10 to none, but on an 



average about 5. 

 Crystals. — Very numerous. 



Hard Bast. — Sparingly developed, discontinuous, in many places 1 cell thick. 

 Wood curve (see Fig. 29). — Body moderately thickened and horns gently 



incurved ; always found entire. 

 Vessels — Largest, j^^ in. 



Average, about half that. 



Comparatively small, moderately numerous, distributed loosely towards 

 upper portion, and generally absent from lower portion of wood. 

 Characteristic features : 

 Section. — Small. 

 Cortical Cavities. — Small. 

 Hard Bast.- Sparingly developed. 

 Wood-curve.- — Symmetrical, and always found entire. 



Vessels. — Comparatively small, moderately numerous, and distributed 

 loosely towards upper portion of wood. 



Vn. — Forms Belonging to New South Wales and Queensland. 



20. E. saligna, Smith ; grey gum-tree. 

 Tree.— Tah. 



Leaves. — Tapering, much paler beneath. 



Size of Section. — | Ime broad by ^ line thick, or Ij times as broad as thick. 

 Outline of Section. — Bounded, with flattened upper surface. 

 Epidermis. — Thickness, ^ in. 



Breadth, about ^i in. 

 Cortical Cavities. — 4"^-' I'oi^nitl to elongated, numbering from 7 to 6. 

 Crystals. — Numerous. 

 Hard Bast.— Very poorly developed, and in many places entirely absent. 



