274 



This is one of the smallest trees of the genus, and is usually found on the 

 gravellv banks at the mouth of the Esk River. It is characterised by the very 

 prominent development of the dorsal point of the \-alves, which distinguishes the 

 fruit cones from all the other species. 



Known locally as " Native Cypress." This is a ver}' small species of Callitris, 

 usually not more than 5 or 6 feet high, and rarely up to 10 feet. It is rarely above 

 2 or 3 inches in diameter. It is fairly common on the extreme edge of river flats 

 on the South Esk River, also St. Anne's River, near Avoca, Tasmania. It is never 

 seen far from the edge of the ri\er. It is erect in habit, usually consisting of 

 several branches rising from the ground. The foliage is dense, and, as the outline 

 is verv SNTumetrical, it forms a handsome and prominent little shrub. (C F. 

 Laseron.) 



III. LEAVES. 

 (fl) Economic (vide Chemistry). 



(h) Anatomy. 



Like most Tasmanian species the contour of a cross-section of the 

 decurrent leaves together with the branchlet is almost triangular, the decurrent 

 channel being hardly perceptible in many instances, while the fundamental tissues 

 of the three leaves have no regular line of demarcation, and so, together with the 

 central cjdinder of the branchlet, form, as it were, one whole structure, somewhat 

 similar to certain leaves of Piniis. 



The dorsal angles are the assimilatory surfaces ; a row of hypodermal cells 

 intervenes between the epidermal and the palisade laj'er of cells, both of which 

 are uniseriate. 



The central column is surrounded by an irregular circle of parenchymatous 

 endodermal cells, which enclose the small leaf bundle and extend around the oil 

 cavit}- when it is present. 



Onl}' a limited number of sclerenchyma and transfusion cells were detected. 



The spongy tissue of the mesophyll forms a loose structure and occupies 

 a fair proportion of the leaf. Stomata are not numerous, and when present 

 were found to occur on the straight, lateral surfaces of the combined three 

 leaves, as obtains in others assuming this shape ; there may possibly be some in 

 the traces of decurrent channels, where also were found a few conical-shaped 

 cuticle cells, and which are fully dealt with under C. glauca. 



