46 BOTANY. 



86. The bundle of the larger Club-mosses (Lycopodiura) 

 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 



FiQ. 39.— Masnifled cross-section ot the stem of a larger Club-moss (Lyco- 

 podlum 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 



