甘露地衣

植

[ noun ]
any of several Old World partially crustaceous or shrubby lecanoras that roll up and are blown about over African and Arabian deserts and used as food by people and animals
<noun.plant>

Manna \Man"na\ (m[a^]n"n[.a]), n. [L., fr. Gr. ma`nna, Heb.
m[=a]n; cf. Ar. mann, properly, gift (of heaven).]
1. (Script.) The food supplied to the Israelites in their
journey through the wilderness of Arabia; hence, divinely
supplied food. --Ex. xvi. 15.

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; called also {manna
lichen}.

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 {Fraxinus
rotundifolia}, the manna ashes of Southern Europe.

Note: {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; {Brian[,c]on manna}, that of the European
larch.

{Manna insect} (Zo["o]l), a scale insect ({Gossyparia
mannipara}), which causes the exudation of manna from the
Tamarix tree in Arabia.


manna lichen \manna lichen\ n.
Any of several Old World semicrustaceous or shrubby lecanoras
that roll up and are blown about over African and Arabian
deserts and used as food by people and animals; same as
{manna}[2].
[WordNet 1.5]