38 • THE TRANSVERSE SECTIONS OF PETIOLES OF EUCALYPTS 



Remarks. — The number of central canals varies occasionally, clue probably to the 

 splitting up of the normal number (two). Thus, in nine successive sections taken from 

 about the middle of the leaf stalk, there were four, two on each side ; and in another 

 petiole, the sections showed five, three on one side and two on another. And, as if 

 to complete the series, a third petiole exhibited no less than six canals — three on 

 either side, one of each being about the normal size, and the other two rather 

 smaller. 



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



22. E. macrorrhyncha, F. v. M.; Victorian stringy-bark. 



Tree.- Tall. 



Leaves. — Elongated, equally green on both sides 



Size of Section. — 1 line broad by | line thick, or about 1^ times broader than 



thick. 

 Outline of Section. — Oval, or nearly round. 



Epidermis.- Thickness, ^ in. 



Breadth, ^,—^m. 

 Cortical Cavities. — j^iu., oval and round, numbering from 8 to 2. 

 Crystals. — Few. 



Hard Bast. — Well-defined layer, several cells thick. 

 Wood-curve (see Fig. 32). — Body exceedingly thick and short; horns stout, 



upright, or sharply inturned ; always found entire. 

 Vessels. — Largest, ~ in. 

 Average, ^ in. 



Large and numerous; pretty equally distributed, but most thickly 

 towards upper portion of wood. 



Characteristic features : 



Section. — Average size. 



Cortical Cavities. — Moderately large. 



Hard Bast.^ — Well-defined, and several cells thick. 



Wood-curve. — Always found unbroken, with much-thickened body, and 



short stout horiis. 

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

 wood. 



