io6 MAIDEN-HAIR FERN. 



from several buds the numerous brown scales which 

 clothe them. Note the two kinds : 



a. Buds showing a rudimentary leaf whose stalk is 

 coiled upon itself, thus : ^ 



b. One or more buds whose central part is simply a 

 continuation of the stem. 



6. Make an outline drawing of the rhizome, showing the 

 size, shape, mode of branching and arrangement of 

 leaves and buds. 



7. The structure. Cut across the rhizome at right angles 

 to its length and examine the cut surface. Observe 



a. The outer ring of brown tissue, the cortical layer. 



b. The oval, circular, or C -shaped white mass, the 

 fibro-vascular bundle. Where a branch or leaf 

 arises two fibro-vascular bundles will be seen, thus : 

 C ^- Find a part of the rhizome showing such an 

 arrangement, and trace the course of the bundles 

 (by cutting a series of rather thick sections) through 

 at least two internodes, noting the modes in which 

 successive branches are given off from the bundle. 

 The smaller C -shaped portion passes into the 

 nearest leaf ; the other gradually enlarges, closes 

 into a circle, elongates into an oval, becomes egg- 

 shape, and finally opens to form two unequal C ' s 

 the smaller of which soon enters the second leaf on 

 the opposite side of the rhizome from the first. 



c. Inclosed by the fibro-vascular bundle a darker 

 brown mass not differing otherwise from that sur- 

 rounding the bundle. 



d. Make an enlarged drawing of the cut end of the 

 stem. 



Cut a rhizome longitudinally through the center, and on 

 the cut surface make out 



