ARAUCARIA 205 



1. A. Cunninghamii, Sweet. 



Moreton Bay Pine. Hoop Pine. Colonial Pine. Coorong. Cumburizi. Coonam 



Transverse. Growth rings not clearly discernible ; tracheids very unequal in 

 irregular, radial rows, round-hexagonal, the walls medium ; the structure 

 open throughout. Resinous tracheids few, widely scattering. Medullary 

 rays prominent, somewhat resinous, broad, i cell wide, distant 2-23 

 tracheids. 



Radial. Ray cells conspicuously contracted at the ends, often very unequal, 

 about equal to i o tracheids ; the upper and lower walls thin and not 

 pitted ; the terminal walls thin, commonly curved, not pitted or locally 

 thickened ; the lateral walls with pits having an obscure border and a slit- 

 like orifice, numerous, 3-8 per tracheid. Bordered pits in 1-2 or 3 

 rows, compact, compressed, hexagonal. Pits on the tangential walls of 

 the summer tracheids wanting. 



Tangential. Rays numerous, low to medium, resinous ; sometimes 2-seriate 

 in part ; the cells very large, unequal, oval or transversely oval, the 

 walls thin. 



2. A. excelsa, R. Br. 



Norfolk Island Pine 



Transverse. Growth rings not determinable ; the unequal tracheids in 

 irregular, radial rows, round-hexagonal, the walls medium, the structure 

 open throughout. Resin-bearing tracheids in small, scattered groups, or 

 in rows parallel with the rays on either side. Rays prominent, broad, 

 somewhat resinous, i cell wide, distant 2-21 rows of tracheids. 



Radial. Ray cells conspicuously contracted at the ends, equal to 6-8 

 tracheids ; the upper and lower walls thin, entire ; the terminal walls 

 thin, not pitted ; the lateral walls with round, bordered pits having a 

 slitlike orifice, about 3-6 per tracheid. Resin-bearing tracheids numer- 

 ous, the resin in thick plates simulating Sanio's bands in the vicinity of 

 rays. Bordered pits in 1-2 rows, compact, hexagonal. 



Tangential. Rays medium, numerous, broad ; the cells oval or squarish, 

 thin-walled, unequal, the thin walls commonly broken down ; i -seriate. 



3. A. Bidwillii, Hook. 

 Bunya-Bimya 



Transverse. Growth rings broad but poorly defined by a slightly more open 

 structure in the early spring wood ; the structure rather dense through- 

 out, the unequal tracheids thick-walled, round-hexagonal. Medullary 

 rays not very prominent, locally very resinous, i cell wide, distant 445 

 rows of tracheids. 



Radial. Ray cells rather high and short, equal to upwards of 5 tracheids ; 

 distant cells strongly resinous ; conspicuously contracted at the ends ; 

 the upper and lower walls very thin and entire ; the terminal walls thin, 

 entire, commonly curved ; the lateral walls with obscurely margined 

 pits ; the orifice linear or slitlike, diagonal, 3-7 per tracheid, in the very 

 high, marginal cells forming high, vertical series. Where resin is 



