46 BOTANY. 
86. The bundle of the larger Club-mosses (Lycopodium) 
contains several parallel plates of tracheary tissue. Between 
the tracheary plates there is in each case a row of sieve- 
tubes imbedded in a lignified tissue composed of elongated 
cells (stony, or fibrous tissue?), Around this central fibro- 
vascular portion there is a layer of soft tissue (parenchy- 
ma), and outside of this a bundle-sheath, exterior to which 
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Fie. 29.—Magnified cross-section of the stem of a larger Club-moss (Lyco- 
podium complanatum), showing a fibro-vascular bundle. 
lies a thick mass of fibrous tissue completely enveloping all 
the previously described tissues. 
87. The bundle in the smaller Club-mosses (Selaginella) 
is much like a single plate of the preceding. There is in 
each bundle a central plate of tracheary tissue, consisting 
of a few narrow spiral vessels in its two edges and a re- 
maining mass of scalariform vessels (Fig. 30). The tra- 
cheary portion is surrounded by a tissue of elongated, thin- 
walled tissue which is, at least in part, a sieve-tissue, In 
