| Summary: | 碩士 === 國立中山大學 === 生命科學研究所 === 83 === The mangrove species Avicennia marina （ Forsk. ）Vierh. occurs
as shrub to 2-7m tree form from tropical to temperate tidal
habitats. It is the most dominant species in the mangrove flora
of Taiwan, distributed along the west coast. The morphology （
SEM）and the anatomy（LM）of the Avicennia marina root system
are described in this thesis. Avicennia marina develops unique
root systems. Underground cable roots radiate shallowly from
the trunk. Ascending, pencil-shaped aerial pneumatophores that
are negatively geotropic project vertically from the sediment
surface. Descending anchor roots grow downward. Pneumatophores
and anchor roots develop as first have four layers of peri-
derm cells, but the above ground portions own more than four
layers of periderm on the surface. In addition, the aerial
portions contain white lenticels and oliver-green surfaces. It
is concluded environmental factors cause main anatomical differ
ences. In Avicennia marina, there are both aquatic vascular
plants'' characteristic─aerenchyma and terrestrial plants''
prually have four layers of peri- derm cells, but the above
ground portions own more than four layers of periderm on the
surface. In addition, the aerial portions contain white
lenticels and oliver-green surfaces. It is concluded
environmental factors cause main anatomical differ ences. In
Avicennia marina, there are both aquatic vascular plants''
characteristic─aerenchyma and terrestrial plants'' property─
exuberant vascular bundles.
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