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2. (Bot.) A name given to lichens of
the genus Lecanora, sometimes blown into heaps in the deserts
of Arabia and Africa, and gathered and used as food.

3. (Bot. & Med.) A sweetish exudation
in the form of pale yellow friable flakes, coming from several trees
and shrubs and used in medicine as a gentle laxative, as the
secretion of Fraxinus Ornus, and F. rotundifolia, the
manna ashes of Southern Europe.

&fist; Persian manna is the secretion of the camel's thorn
(see Camel's thorn, under Camel); Tamarisk
manna, that of the Tamarisk mannifera, a shrub of Western
Asia; Australian, manna, that of certain species of
eucalyptus; Briançon manna, that of the European
larch.

Manna grass (Bot.), a name of several
tall slender grasses of the genus Glyceria. they have long
loose panicles, and grow in moist places. Nerved manna grass
is Glyceria nervata, and Floating manna grass is G.
fluitans. -- Manna insect
(Zoöl), a scale insect (Gossyparia mannipara),
which causes the exudation of manna from the Tamarix tree in
Arabia.


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