182 A TEXTBOOK OF GENERAL BOTANY 
The strands of sclerenchyma around the bundles of some 
_ plants are extracted and used in various ways as fibers. Maguey 
and sisal fibers are the strands of sclerenchyma around the 
bundles of the leaves of species of Agave (Fig. 119), while 









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Fig. 128. Longitudinal section through a vascular bundle of sugar cane 
(Saccharum officinarum) 
p, parenchyma; s, sclerenchyma of bundle sheath; a, air space; av, annular 
vessel ; sv, spiral vessel ; st, sieve tube. (x 150) 
abaca (Manila hemp) is composed of similar strands from the 
leaf bases of Musa teatilis, a plant which is almost identical — 
with the banana in appearance. 
The arrangement of the different elements in the bundles of 
corn and sugar cane is characteristic of many monocotyledonous 
bundles (Figs. 127, 128). In these cases the bundles are sur- 
rounded by a sclerenchyma sheath which is widest on the sides 
toward the center and toward the periphery of the stem. On 
the side near the interior of the stem, just within the bundle 
sheath, there is usually a conspicuous air space. Next to this 
a 
