52 R. H. CAMBAGE. 



Parallelantherce. — The parallel anther is by far the com- 

 monest type of anther in the genus, being found all over 

 Australia, and is the form which belongs to the closely 

 allied genus Angophora. It has been noticed, however, 

 that this form becomes less common above an altitude of 

 4,000 feet. If we consider that all the present forms of 

 anther have been evolved from one original type, then it 

 would seem that the type known as parallelantherse bears 

 the nearest resemblance to the original. This hypothesis 

 is supported by the wide distribution of this particular 

 form, and the fact that it passes by gradual stages to the 

 porantherse on the one hand and the renantherse on the 

 other. 



In associating anthers with leaves it is seen that the 

 parallel anther and the leaf with oblique venation as well 

 as the transverse venation, usually go together, but it is 

 not the form of anther which is associated with the parallel 

 venation. 



Porantherce. — The porantherse section is largely confined 

 to the inland portions of Eastern Australia, and compared 

 with the last mentioned type, is a comparatively small 

 section, being chiefly found amongst the Box-trees, Iron- 

 barks, and some Mallees. For the purpose of this address 

 it is made to include the form known as the truncate anther. 

 Iu New South Wales the porantherae has its greatest num- 

 ber of representatives in the Interior and Western Slopes, 

 and occurs to a less extent in the Coastal Area. The one 

 condition that it distinctly avoids is the cold, and it is 

 absent from the Mountain Region above elevations of about 

 3,000 feet, south of latitude 31°, and also from Tasmania, 

 one of the trees with this type of anther best able to face 

 the cold being E. melliodora. The form of leaf- venation 

 associated with this anther is the oblique venation. 



