218 PROCEEDINGS OP THE ROVAI, SOCIETY OF QUEENSLAND. 



Trees Exuding Latex. — A number of trees exude a 

 milky juice or latex when the bark, sapwood, or succulent 

 parts is cut or ruptured. This group includes the majority 

 of the Queensland species of the natural order Sapotaceee, 

 comprising the geiiera ,Sidcroxylon, ChrysophyUum, 

 Lnenma, Hormogyne and Mitmisops; many species of the 

 natural order JJriiracecv such as the species of fig trees 

 (Ficiis) and the axe-handle-wood (Pseuelomonis Brnnoni- 

 ana) ; several species of the natural ordei Euphorhiaceee 

 such as the scrub poison tree {Excwcaria Dallachyana) 

 and the majority of the species of the natural order 

 Apocynaccee such as Ahtonia spp. including the native 

 quinine tree (Alstonia constricta) and the milky pine {A. 

 scholaris), Cerhera odollam and Ochrosia spp. Among the 

 species of figs. Fiats stenocurpa is exceptional, as its juice 

 is not milky. The fiow of latex from species of Fie us and 

 Exceccaria is generally copious. 



Trees Whose Sap or Woody Farts Change Colonr on 

 Exposure. — The scrub bloodwood (Balogtiia lucida), a tree 

 rarely exceeding 1 foot in barrel diameter, has a bark more 

 or less stained by a reddish brown sap which is frequently 

 transformed into scattered hardened spots or nodules giving 

 the bark a rather rough appearance. When the bark is 

 freshly cut the sap appears colourless and turns bright red 

 after a few seconds' exposure to the air. The native olive 

 {Olea peiniculata) attains about 1 foot 8 inches in barrel 

 diameter in South Queensland rain forests. The barrel is 

 sometimes flanged at the base and the bark on large trees 

 •slightly fissured or wrinkled with small warts arranged in 

 longitudinal lines or rows in the wrinkles or shallOM' fissures. 

 The bark and sapwood when freshly cut are white or pale, 

 but turn i)iuk after being exposed to the air for ten or fifteen 

 minutes. 



Trees WJiose Freshly Cut Bark and Sapwood have a 

 Characteristic Oelour. — The mango bark {Bursera australa- 

 sica) possesses an odour of mangoes in its freshly cut bark 

 and sapwood. The sassafrases {Cinnamomum Oliveri, 

 Doryphora sassafras, and Daphneindra aromatica) have a 

 strong smell of sassafras. Native cascarilla [Grot on 

 insularis) has an odour like that of official cascarilla bark 

 [Croion Eleuteria). Red cedar {Cedrela toona var. aus- 

 tralis), rosewood {Dysoxylon Fraseranum) and incense 



