AS AIDS IN THE DETERMINATION OF SPECIES. 43 



Epidermis. — Thickness, ~ in. 



Breadth, ~ — ,-An iii-. or sometimes as broad as thick. 

 Cortical Cavities. — ^ in., oval to irregularly round, numbering about 6. 

 Crystals. — Moderately numerous. 



Hard Bast. — Almost continuous, regular, generally two or three cells thick. 

 Wood-curve (see Fig. 38). — Body curved and moderately thickened (thickness 



sometimes ^ in.), with short and sharply incurved horns. 

 Vessels. — Largest, ~ in. 



Average, about half that. 



Small, numerous, and generahy distributed towards upper and middle 

 portion of wood. 

 Characteristic features : 

 Section . — Small . 



Epidermis. — Relatively thin, component cells often as broad as thick. 

 Cortical Cavities. — Small. 

 Hai-d Bast. — Regular, but not very dense. 



Wood-curve. — Moderately thick, and horns somewhat sharply uacurved. 

 Vessels. — Small, numerous, and distributed towards upper and middle 

 portion of wood. 



XII.— Form Belonging to South Australia, Victoria, New South Wales, and 



Queensland. 



29. E. leiicoxylon, F. v. M.; Victorian ironbark. 



Tree. — Moderate size. 



Leaves. — Equally dull-green on both sides, with copious, pellucid oil-dots. 

 Size of Section. — IJ lines broad by f line thick, or twice as broad as thick. 

 Outline of Section. — Roundish, flattened, or somewhat quadrangular. 

 Epidermis. — Thickness, ^ in. 



Breadth, ji _ ^L^ iu. 

 Cortical Cavities. — -— in. oval, numbering from 9 to 1, or none. 

 Crystals. — Moderately numerous. 



Hard Bast. — Poorly developed ; in many places entirely absent. 

 Wood-curve (see Figs. 39 and 39^, b, c). — Body variable in thickness, and longer 



or shorter horns, gently incurved. 

 Vessels. — Largest, ~ in. 

 Average, j^ in. 

 Medium-sized and numerous, radially arranged, and regularly distributed. 



