236 A CONTRIBUTION TO, ETC. 



(4.) E. cinerea ; (5.) E. acmenioides ; (6.) E. rolusta ; (7.) E. 

 lotryoides; (8.) E. resinifera and var. grandiflora ; (9.) E. corym- 

 bosa; and (10.) E. eximia. 



(1.) E. microcorys is a tree of the Mahogany kind, growing at 

 Port Macquarie, and in the North- Western Interior. The 

 flowers resemble those of the White Gum (E. licBmastoma)-> 

 but the bark is altogether different. Not having seen this species 

 in a living state, I feel uncertain about the place it should occupy 

 in the cortical system, but from the fact of its having bark and 

 foliage similar to the White Mahogany, I am inclined to regard 

 it as a variety of E. acmenioides. It is probable that E. microcorys 

 is of the same kind as that collected at Brisbane Water for the 

 Paris Exhibition (No. 45, see Catalogue.) 



(2.) E. polyantJiemos is a tree of moderate size, occurring on 

 the banks of the Nepean, and other parts of Eastern Australia. 

 It is called " Lignum vitse," " Poplar- '.eaved Gum," or "Bastard 

 Box." It has a thick rough bark, and the wood, which is of a 

 brown colour towards the centre, is very hard and tough. 



(3.) E. pulverulenta, and (4.) E. cinerea seem to be two varieties 

 of the small tree usually called "Argyle Apple." It is similar 

 in appearance to Angopliora subvelutina or the " Apple" of the 

 colonists, as the leaves are opposite, and the bark furrowed and 

 wrinkled, but the seed-vessel is very different, being sub-globose 

 truncate, not contracted at the orifice, and not marked by any 

 prominent ribs. In the neighbourhood of Berrima, this tree 

 grows on rocky or stony places of the sandstone formation. 



(5.) E. acmenioides is arranged by Mr. Bentham, as a variety 

 of E. pilularis or the " Blackbut," but at the same time he ex- 

 presses an opinion that it may probably be a distinct species. 

 There can be no doubt as to its being perfectly distinct from E. 

 pilularis, as the trees belong to different sections of the cortical 

 system, and the flowers, leaves, and seed vessels of E. acmenioides 

 or "the White Mahogany," are smaller than those of the " Black- 

 but." This species approaches nearer to the " Stringy Bark," 

 and indeed, is sometimes mistaken for it, but the bark is not so 

 fibrous, nor are the leaves so oblique, whilst the specific gravity 

 of the wood is much greater. " White Mahogany" is plentiful 

 to the north of Parramatta, and in many parts of Eastern Aus- 

 tralia, near the coast. The timber is useful for building purposes, 



