40 THE TRANSVERSE SECTIONS OF PETIOLES OF EUCALYPTS 



Size of Section.— Ij lines broad by 1 line thick, or Ij times broader than thick. 

 Outline of Section. — Oval to circular, sometimes flat on upper surface. 

 Epidermis. — Thickness, -^ — ^o^^- 

 Breadth, about ,4n in. 



' 1150 



Cortical Cavities. — j^ in., roundish, numbering from 7 to 2. 



Crystals. — Few. 



Hard Bast. — Well developed, continuous, and many cells thick. 



Wood-curve (see Fig. 34). — Comparatively slender body, vv^ith short horns 



elevated or gently incurved. 

 Vessels.— Largest, ~ in. 



Average, about half that. 



Large, numerous, and pretty regularly distributed, but most 

 numerous towards upper portion of wood. 



Characteristic features : 

 Section. — Large. 

 Epidermis. — Thickish. 

 Cortical Cavities. — Large. 



Hard Bast. — Well developed and dense, especially between the horns. 

 ■ Wood-curve. — With slender body and short horns. 

 Vessels. — Large, numerous, and jjretty regularly distributed. 



25. E. amygdalina, Labillardiere ; giant Eucalypt, Daudenong peppermint, mountain 

 ash. 

 Keputed to be the tallest of trees. 



Leaves. — Thin, equally green on both sides, with copious and transparent oil- 

 dots. 

 Size of Section. — About J line broad and thick, or equally broad and thick. 

 Outline of Section. — Oval to round, with occasionally a flattened upper surface. 

 Epidermis. — Thickness, ~ — ^^ in. 



Breadth, J^„ — j^ in. 

 Cortical Cavities. — ~ in., oval or round, niunbering from 7 to 2. 

 Crystals. — Numerous. 



Hard Bast. — Sparingly developed, one or a few cells thick. 

 Wood-curve (see Fig. 35). — Body excessively thick, with short stout horns elevated 



or slightly incurved ; always found entire. 

 Vessels. — Largest, ^^^ in. 



Average, about half that. 



Small, moderately numerous, on radiating lines, generally equally 

 distributed, but scanty towards lower margin. 



