271 



All the cells of the medullary rays are parenchymatous, both the inner 

 and outer. In Figure 186 the three black lines mark the medullary rays by the 

 presence of a manganese compound. Pitted cells are numerous on the radial 

 walls of the tracheids, whilst the perforations of the ray cells are circular, with 

 about two apertures between each wall of the tracheids. Figures 187-8. 



V. BARK. 



Chemistry. 



The sample of bark was taken from a tree 3 to 4 inches in diameter growing 

 near Sydney. The bark was grey to brown externally, furrowed, soft, and fibrous. 

 The greatest thickness was 10 mm. 



The following results were obtained with the air-dried sample : — 



Moisture ... ... 12-1 per cent. 



Total extract ... i6-8 ,, 



Non-tannin ... 4-9 ,, 



Tannin ... ... ii-g ,, 



16. Callitris oblonga. 



Rich., Con if., 49 T , 18 F., 2 (1826). 



(Syn. : — C. Gunnii, Hook. f. in Hook. Lond. Journ., IV, 147; Frenela australis, 

 R.Br.; Mirb. in Mem. M-us. Par. XIII, 74, not of End.; Hook. f. Fl. Tasm. 

 I, 352 t. 97; F. Gunnii, 'Endl. Syn. Conif., 38; Parlat. in DC. Prod. XVI, 

 ii, 450; also according to Parlatore ; F . variabilis, Qa.rr . and F. ma crostachy a, 

 Gord.) 



Habitat. 



This species is quite endemic to Tasmania, where it was collected by 

 Robert Brown at Port Dalrymple, and on the gravelly banks of the South Esk 

 River, near Launceston. 



I. HISTORICAL. 



From the above list of synonyms it will be seen that this Callitris has 

 received no little attention at the hands of systematists. It was first collected by 

 Robert Brown, as stated above, and afterwards in the same locality by several 

 distinguished botanists, and Sir Joseph D. Hooker, in his " Flora Tasmanica," 

 gives a splendid illustration of the species. 



