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1.27 IS of the stem of the monocotyledon<br />
<strong>Zea</strong> <strong>mays</strong> (maize).<br />
Numerous scattered collateral<br />
vascular bundles lie in p::aren'<br />
chymawus ground tissue and in<br />
each the phloem (I) is situated<br />
nearest to the epidermis (2). Vascular<br />
cambium is absent between<br />
the xylem (3) and phloem (ef.,<br />
t.t 1). (LM x 85.)<br />
I Phloem<br />
2 Epidenms<br />
3 Xylem<br />
1.28 TS through the young stem of [he dieoryledon<br />
HeJiDnthus (sunflower). The collareral vascul::ar bundles lie<br />
in a peripheral cylinder with an extensh'e pith (I) siruated<br />
intem::ally and narrow cortex (2) lying externall)·. Each<br />
bundle is demarcated on the outside by a cap of phloem<br />
fibres (3) and a prominem fascicular vascular cambium (4)<br />
separates the xylem (5) from the phloem (6); but no<br />
interfascicular cambium has yet differenriatcd in the<br />
parenchyma between the bundles. (LM x 30.)<br />
1 Pith<br />
2 Correx<br />
3 Phlocm fibres<br />
4 Fas
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