28 AUSTRALIAN NATIVE PLANTS. 4 
irregular, flattened shape. In appearance it very much resembles 
lime which has naturally crumbled or slacked by exposure to a 
moist atmosphere. 
It is composed of an unfermentable sugar called Lucalin, 
which is peculiar to the sap of the Eucalyptus, together with a 
fermentable sugar, supposed to be Dextroglucose. The manna is 
derived from the exudation of the sap, which “ drying in the hot 
parched air of the midsummer, leaves the sugary solid remains in 
a gradually increasing lump, which ultimately falls off, covering 
the ground in little irregular masses.” (McCoy.) This exudation 
of the sap is said by McCoy to take place from the boring of the 
“* Great Black or Manna Cicada.” (C. me@rens.) 
The Hon. William Macleay of Sydney is, however, by no 
means of that opinion, as he thinks it cannot be doubted that the 
manna is the work of a gall-making Coccus. The subject requires 
clearing up, and it is to be hoped that a naturalist will give his 
earnest attention to the matter. 
South Australia, Tasmania, Victoria, and New South Wales. 
82. Eucheuma speciosa, 7. Agardh., (Syn. Gigartina speciosa, 
Sond.), N.O., Algz, Plate txiv. Harvey’s Phycologia 
Australasica. 
“Jelly Plant,” of Western Australia. 
This is a remarkable sea-weed of a very gelatinous character 
which enters into the culinary arrangements of the people of 
Western Australia for making jelly, blanc-mange, etc. Size and 
cement can also be made from it. It is cast ashore from deep 
water. 
Coast of Western Australia. 
83. Eugenia Jambolana, Zam., (Syn. EL. Mooret, F.v.M.; 
Syzygium Fambolanum, DC.), N.O., Myrtacee, B.FI. iii., 
283. £. Afloorei in Muell. Cens., p. 59. 
‘* Durobbi,”’ of the aboriginals. 
‘‘The fruit is much eaten by the natives of India; in ap- 
pearance it resembles a damson, has a harsh but sweetish flavour, 
