107 
No. 73. 
Casuarina suberosa, Otto et Dietr. 
The Black Slie-Oak. 
(Natural Order CASUARIN AC EyE.) 
Botanical description. —Genus, Casuarina, see p. 74, Part XIII. 
Botanical description. —Species, C. suberosa, Otto and Dietr, Algl. Garten - 
zeit, 1841, p. 155 ; Micp Rev. Cas. 51, t. 6, and in DC. Prod, xvii., ii, 337. 
A tree of 30 to 40 feet, the specimens closely resembling those of C. equisetifolia, the whorls 
similarly 7-merous or the parts varying from 6 to 8, and often monoecious like that species. 
Branches. —Seldom if ever corky ; the branchlets usually slender and quite glabrous. 
Male Spikes. —Much more slender and interrupted, the short sheaths not overlapping those next 
above. 
Fruit Cones. —More frequently tending to become ovoid or oblong, truncate at both ends, the valves 
more prominent, glabrous or nearly so with usually a short, broad, thick, but almost scale-like, transverse 
dorsal protuberance at the base rarely extending nearly to the apex of the valve.—(B.F1. vi, 197.) 
This species lias been several times figured, e.g., Micp Rev. Crit. Cas., t. 6 and 
t. 4 as ( C. leptoclada ) ; Hooker, FI. Tas. i, t. 96 ; Mueller, Key Victorian Plants, t. 
25 ; Maiden and Campbell, Flowering Plants and Ferns of New South Wales, t. 23. 
C. suberosa, Otto and Dietr., Newport to Barrenjoey, R. H. Cambage and J. H. Maiden, July, 1905. 
We draw attention to a pigmy form, 2 feet high and with small cones, of this species. It is erect 
and yet bushy, reminding one of the habit of C. nana. C. suberosa, of normal size, is in the immediate 
neighbourhood, and while we note no characters other than that of size in regard to this form, we think 
that its dwarf habit should be pointed out. —(Maiden and Betche, Proc. Linn. Soc., A T .S. W., 1905.) 
Botanical Name. — Casuarina, see p. 79, Part XIII ; suberosa, Latin, corky, 
in allusion to the appearance of the bark. The name is not specially appropriate. 
Vernacular Names. —On this tree a number of appellations have been 
bestowed, viz.:—“ Erect Slie-Oak ” (a name which refers to the general habit of the 
tree) ; “ Eorest Oak ” (a name which had perhaps better be left to C. to' ulosa ) is in 
common use for it over large areas of country. 
In Tasmania it goes by the name of “Swamp Oak” and “Marsh Oak”; other 
species pass under these names on the mainland. On the mainland C. suberosa is 
not a moisture-loving species. In Tasmania it was pointed out to me ns “Bull Oak,” 
but here, again, another species is so-called in Australia. In Tasmania it is also 
called “ Ile-Oak.” I propose the name “ Black Shc-Oak ” for the species. It is 
fairly appropriate, and has not been adopted for any other species. 
