524 



" Renan.tlie.rai . . . , is practically confined to South-eastern Australia, and is the principal 

 form occurring in the higher Mountain Eegion .... Next to the mountains it is most common 

 in the Coastal Area, but on the drier Western Slopes is rare indeed, while in the still drier Interior of 

 New South Wales this form of anther does not occur at all. 



" Considering this general distribution of the last named two types of anther, there seem reasonable 

 grounds for assuming that one necessary condition for the development of the former is warmth, while 

 the latter is largely the result of moist and cool surroundings. 



There are anomalous members of the section Renantherre, which in an evolving genus is not a 

 matter for surprise, examples being found in such species as E. Smithii and microcorys .... 



Porantherce. — The Porantheree 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, Ironbarks and some Mallees. For the purpose of this address it is made to 

 include the form known as the truncate anther. In New South Wales the Porantherae has its greatest 

 number 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. mdliodora .... 



" It is pointed out that the Eucalypts which belong to the Porantherae section rather favour the 

 basic than the siliceous formations, and it seems not improbable that an extended study of that phase of 

 development which results from response to certain plant food, may largely help to elucidate some of the 

 mysteries of evolution in the genus. 



" Parallelanthercp. — The parallel anther is by far the commonest 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 Parallelantherte 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 

 Porantheras on the one hand and the Renantherfe on the other . •. . ." (Proc. Rot/. Soc, N.S.W. 

 xlvii, 52, 1913.) 



Maiden (1916) in Maiden and Betche"s "Census of New South Wales Plants,' 

 made the following tentative classification (N.B. For New South Wales species only !) : 



A. Renantherce. (Kidney-shaped anthers.) 



B. Terminales. (Anthers with terminal pores, erect or oblique on the filament). 



C. Porantheroidece. (Small globular anthers, gland at top, filament at base or 



nearly so).* 



D. Macrantherce. (A large group, to be subdivided later, of anthers having the 



openings parallel, with gland at back. Some are versatile, others non- 

 versatile). 



E. Corymbosce. (The following species, with anthers belonging to the Macrantherse 



may, for convenience, be kept apart as belonging to a well-defined group 

 termed Bloodwoods. See B.F1. iii, 198.) 



F. Eudesmiecp. (This and the Corymbosse are Benthanrs sub-series. See B.F1. iii, 



199.) 



•"The following tl ree species may perhaps be looked upon, as regards anthers, as intermediate between 

 Porantheroidie and the Micrantherse." 



