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5.33 TS of bulliform cells in the lamina of the grass Zeo<br />
mtl)'S (maize). The large, thin-walled and highly vacuolatc<br />
bulliform cells (I) of thiS monocOlykdon are confined to<br />
the adaxial epidermis. When they lose water, they<br />
conrrihute to the rolling of the leaf. T racheary elements (2),<br />
sicvc lUbes (3). (Phase LM x 495.)<br />
I Bulliform cells<br />
2 T rachear)' elements<br />
3 SieH: rube I Veins<br />
2 Lignified fibres<br />
3 Adaxial surface<br />
5.34 TS of the isobilateral leaf of the monocotyledon<br />
Phormillm tenox (),lew <strong>Zea</strong>land flax). The veins (I) are<br />
embedded in thick-walled, heavily lignified fibres (2) which<br />
form a series of 'girders' linking ad- (3) and abaxial (4)<br />
surfaces. The fibres are used commercially for cordage and<br />
individual fibtes may reach up to 15 mm in length.<br />
.\1e.sophyl1 (5), non-photosyntheri
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