30 THE TRANSVERSE SECTIONS OF PETIOLES OF EUCALYPTS 



Hard Bast. — Irregularly developed, discontinuous, many-celled, or only 1 cell thick. 

 Wood-cm've (see Fig. 21). — Body thickened, with the two short horns gently 



incurved, and approaching each other. 

 Vessels.— Largest, -^ in. 



Average, about half that. 



Medium-sized, regularly distributed, but not crowded. 

 Characteristic features : 



Section. — Average size, equally broad and tliick. 



Epidermis.— Relatively thick. 



Cortical Cavities. — Moderately large, but few. 



Hard Bast.^Weak and irregularly developed. 



Vessels. — Medium-sized, and very regularly distributed. 



12. E. calophyl/a, BvoYfu; Calophyllum-like Eucalypt. 



Tall Tree. 



Leaves. — Broad, acute, thick, more horizontal than vertical, and much paler 



beneath. 

 Size of Section. — 1^ lines broad by IJ lines thick, or nearly IJ times broader 



than thick. 

 Outline of Section. — Oval to round, and usually flattened on upper surface. 

 Epidermis. — Thickness, variable in same section from — in. to ^^ in. 

 Cortical Cavities. — Largest, i iii-; I'omid or oval, numbering from 14 to 3. 

 Central Canals. — Normally two, oval, one-g^in., other |, in., or sometimes half that. 

 Crystals. — Moderately numerous. 



Hard Bast. — Very sparingly developed, only in small isolated patches. 

 Wood-curve (see Figs. 22 and 22a). — Generally somewhat slender, and of nearly 

 equal thickness throughout ; the horns often approaching each other. 

 Vessels. — Largest, ^ in. 

 Average, ^^ in. 



Comparatively large and numerous, and distributed in radiating lines 

 mostly towards upper portion. 

 Characteristic features : 

 Section. — Large. 



Cortical Cavities. — Generally large and numerous. 

 Central Canals. — Usually two ; very large, relatively to the others. 

 Hard Bast. — Very sparingly developed. 

 Wood-curve. — With moderately-thickened body and horns often 



approaching. 

 Vessels. — Large, numerous, and distributed mostly towards upper portion 

 of wood. 



