Eucalyptus Manna. Australian Manna.—This substance exudes during the summer months from punctures made in the bark and leaves of the Australian tree Eucalyptus viminalis Labill. (fam. Myrtaceae). It occurs in small round opaque masses, and is said medicinally to resemble ordinary manna. It contains melitrose. A similar manna is also formed on Eucalyptus Gunnii Hook. The "blue-grass manna" of Australia occurs on the stems of Andropogon annulatus Forsk. (fam. Gramineae). The latter contains 75 per cent. of mannite.