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^20 introduction to botany.
Collar.
Collum, Coarctura, Limes communis, Fundus plants,
Nodus vitalis. The plane interceding hetween the plumule
and the radicle, which afterwards becomes that hetween the
root and the stem; or the place where the Jihres commence on
the one hand to rise up, and on the other hand to descend.
Ascending, Collum ascendens. Rising out of the ground
in germination, along with the plumule and cotyledons.
Abies, Mirabilis Jalapa, Avicennia.
Descending, descendens. Burying itself deeper in the
ground, during germination, along with the radicle. Damasonium
Dalechampii.
As it is most frequently impossible to distinguish the
collar while in the seed, from the radicle, it is usually comprehended
under that name.
Plantule.
Plan tula. The embryo when in a state of germination.
Acrospire, Acrospira. The plumule when it first bursts
out of the seed covers.
Seed leaves, Folia seminalia. The cotyledons when expanded
by germination, and rising out of the ground.
Such are the different varieties of form to be found in
plants, taken m general; but a few tribes of them, such as
terns, mosses, lichens, algse or marine plants, and mushrooms,
differ so much in their structure, especially in the
organs destined for reproduction, that they require peculiar
terms to describe their parts.
AGAMOUS AND CRYPTOGAMOUS PLANTS.
Cormus, Anabasis, Frojis. Every part of an agamous or
cryptogamous plant, except the roots or holdfasts, and the
organs of reproduction.
Sporangium, Perisporium. The part that immediately
contains the seeds or sporae, analogous to the fruit of phanerogamous
plants.
Spore, Spora, Sporata, Gongylus, Besimen. The reproductive
corpuscles of agamous plants, analogous to the seed
ot sexual plants