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3.31 TS of n cortienl mucil:lge duct in<br />
the acrinl root of the monocotyledon<br />
Philodendro" saggitifolillm. These oo:;cur<br />
in the p:lrenchymatous cortex (I, d.,<br />
3.4) and each consistS of a narrow<br />
central duct (2) surrounded by a single<br />
layer of secrc[Ory cells (3). The mucilage<br />
duet is itself enclosed witbing severnl<br />
layers of fibres (4). (lM x 550.)<br />
I Parenchymatous conex<br />
2 CcnlTal duci<br />
3 Secretory cells<br />
4 Fibres<br />
3.32 leaf of the dicotyledon AJebemilfa<br />
showing guttation. Water is excreted from<br />
numerous hydathodes (modified StOmata)<br />
located at the leaf matgins. Cunarion may<br />
be a meo;:hanism to prola:t the intercellular<br />
space sySlem of Ihe leaf from beeoming<br />
waterlogged in conditions of excessive<br />
root pressure. (Copyright of T. Norman<br />
Tail.)<br />
3.33 XeroJllorphic shoot system of the<br />
dicotyledon E"/Jhorbia canadensis with<br />
its leaves reduced to spines. The stem<br />
contains an elaborate lariciferous system<br />
and rhe wounded stem has exuded latex<br />
(1) which is congealing on to the volcanic<br />
rock on which the bush is growing.<br />
I LatcX<br />
3.33<br />
71<br />
3.31<br />
3.32
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