ARAUCARIA 



2. *DAMMARA, J LAMB. PLATES 14 AND 1 5 



203 



Transverse. Growth rings more or less clearly defined. Resin-bearing 



tracheids more or less prominent. 

 Radial. Rays wholly devoid of tracheids. Bordered pits hexagonal in 1-3 



rows. Spiral tracheids wanting. 

 Tangential. Medullary rays all of one kind and i-seriate, usually composed 



of broad cells. 



1. D. australis, Steud. 

 Kanrie. Coiudie Pine 



Transverse. Growth rings very variable and usually poorly defined. Summer 

 wood thin, often obscure, the structure open but the tracheids thick- 

 walled, passing gradually into the spring wood. Spring wood of large, 

 thickish-walled, very variable tracheids with distinctly rounded lumens. 

 Resinous tracheids rather numerous, not very prominent, generally in 

 rows on either side of the medullary rays. Medullary rays prominent, 

 rather resinous, i cell wide, not numerous, distant 2-27 rows of 

 tracheids. 



Radial. Medullary rays devoid of tracheids ; the resinous cells strongly 

 contracted at the ends, equal to about 5 spring tracheids ; the upper 

 and lower walls thin and not pitted ; the terminal walls thin and entire, 

 not locally thickened ; the lateral walls with round, bordered pits and a 

 diagonal, lenticular orifice, 2-6 per tracheid. Wood tracheids usually 

 radially thickened opposite the medullary rays, with the development of 

 resinous plates simulating Sanio's bands. Bordered pits hexagonal, 

 chiefly in 2, or more rarely 1-3, rows. Pits on the tangential walls of 

 the summer tracheids very numerous, large, and prominent. 



Tangential. Fusiform rays wholly wanting. The resinous rays strictly 

 i-seriate, the cells very broad, unequal, oval or transversely oval, the 

 thin walls often broken out. 



3. * ARAUCARIA, Juss. PLATES 16 AND 17 



Transverse. Growth rings not determinable, or at most poorly defined. 

 Resin passages and specialized resin cells entirely wanting. Resin- 

 bearing tracheids more or less prominent. 



Radial. Rays wholly devoid of tracheids. Bordered pits usually hexagonal, 

 multiseriate. Spiral tracheids wholly wanting. 



Tangential. Fusiform rays wholly wanting. 



1 The genus Protodammara has been created by Hollick and Jeffrey for the 

 reception of certain cretaceous cones, but at present it does not contain any wood. 



